Journal of Preventive Medicine and Public Health

Original Articles

Impact of COVID-19 Control Measures on Birth Outcomes in Ho Chi Minh City, Vietnam: Tinh Ho Huu, Nguyen Do Phuc Nhu, Nhan Ho The, Hang Tran Thi Thuy, Chinh Dang Van; J Prev Med Public Health. 2025;58(6):620-628. Published online August 6, 2025; DOI: https://doi.org/10.3961/jpmph.25.177

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Abstract Summary PDF Supplementary Material: Objectives
Studies of the associations between coronavirus disease 2019 (COVID-19) control measures and infant health in Vietnam are limited. This study investigated differences in birth outcomes between pregnancies during the COVID-19 pandemic and those before the pandemic.
Methods
Data on infants born alive between 2016 and 2023 in Ho Chi Minh City (HCMC) were collected. For each infant, the estimated first day of pregnancy was calculated based on birth date and gestational age. Linear and logistic regression analyses were conducted to identify significant associations. The birth outcomes examined included decreased birth weight (BW), low birth weight (LBW), term LBW, and preterm birth (PTB). The models were adjusted for infant sex, birth order, gestational age, and maternal age. The COVID-19 pandemic period in HCMC was defined as April 2020 to December 2022.
Results
Among 172 017 infants, 31.4% had at least 1 trimester of gestation during the COVID-19 pandemic, 44.2% were first births, and 52.0% were male. Infants with full gestation during the pandemic had significantly lower BW (by 20.7 g) compared to those born pre-pandemic. Pregnancy during the COVID-19 pandemic was associated with higher rates of LBW, term LBW, and PTB compared to the pre-pandemic period. The odds ratios (95% confidence intervals) were 1.21 (1.15 to 1.27), 1.28 (1.18 to 1.39), and 1.10 (1.06 to 1.15), respectively.
Conclusions
The COVID-19 pandemic was associated with elevated risk of adverse birth outcomes. Lessons learned from the COVID-19 response should be applied to prepare for future outbreaks.; Summary

Key Message
This study examined birth outcomes among 172,017 infants in Ho Chi Minh City, Vietnam, comparing pregnancies during the COVID-19 pandemic (April 2020-December 2022) with pre-pandemic periods. Infants with full gestational exposure to the pandemic had significantly lower birth weights (by 20.7 g) and increased risks of low birth weight, term low birth weight, and preterm birth, with odds ratios ranging from 1.10 to 1.28. These findings suggest that COVID-19 control measures were associated with adverse birth outcomes, underscoring the importance of applying lessons learned for future outbreak preparedness.

Analysis of the Incidence of Macrosomia in Japan by Parental Nationalities at 5-year Intervals From 1995 to 2020: Tasuku Okui; J Prev Med Public Health. 2023;56(4):348-356. Published online July 3, 2023; DOI: https://doi.org/10.3961/jpmph.23.133

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Objectives
We investigated trends in the incidence rate of macrosomia and its association with parental nationalities using Vital Statistics data in Japan.
Methods
We used singleton birth data every 5 years from 1995 to 2020. The incidence rate of macrosomia was calculated according to specific attributes (maternal age, infant’s sex, parental nationalities, parity, and household occupation) over time (years). In addition, a log-binomial model was used to investigate the relationship between the incidence of macrosomia and the attributes. This study compared Korea, China, the Philippines, Brazil, and other countries with Japan in terms of parental nationalities. “Other countries” indicates countries except for Japan, Korea, China, the Philippines, and Brazil.
Results
The study included 6 180 787 births. The rate of macrosomia in Japan decreased from 1.43% in 1995 to 0.88% in 2020, and the decrease was observed across all parental nationalities. The rates for Japanese parents were the lowest values among parental nationalities during the timespan investigated. Multivariate regression analysis showed that mothers from Korea, China, the Philippines, Brazil, and other countries had a significantly higher risk of macrosomia than those from Japan (risk ratio, 1.91, 2.82, 1.59, 1.74, and 1.64, respectively). Furthermore, fathers from China, the Philippines, Brazil, and other countries had a significantly higher risk of macrosomia than those from Japan (risk ratio, 1.66, 1.38, 1.88, and 3.02, respectively).
Conclusions
The rate of macrosomia decreased from 1995 to 2020 in Japan for parents of all nationalities, and the risk of macrosomia incidence was associated with parental nationality.

Summary

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Machine learning approaches for predicting fetal macrosomia at different stages of pregnancy: a retrospective study in China
Qingyuan Liu, Simin Zhu, Meng Zhao, Lan Ma, Chenqian Wang, Xiaotong Sun, Yanyan Feng, Yifan Wu, Zhen Zeng, Lei Zhang
BMC Pregnancy and Childbirth.2025;[Epub] CrossRef
Association between parental nationalities and childhood overweight/obesity in Japan: An analysis of nationally representative survey data
Tasuku Okui, Naoki Nakashima
Clinical Epidemiology and Global Health.2025; 33: 102042. CrossRef
Association of grand multiparity with adverse birth outcomes and sociodemographic characteristics: an analysis of nationwide birth data in Japan
Tasuku Okui, Naoki Nakashima
Reproductive Health.2025;[Epub] CrossRef
Comparisons of the Rates of Large-for-Gestational-Age Newborns between Women with Diet-Controlled Gestational Diabetes Mellitus and Those with Non-Gestational Diabetes Mellitus
Sirida Pittyanont, Narongwat Suriya, Sirinart Sirilert, Theera Tongsong
Clinics and Practice.2024; 14(2): 536. CrossRef

Antenatal Care Services and Incidence of Low Birth Weight: A Comparison of Demographic and Health Surveys in 4 ASEAN Countries: Miftahul Arsyi, Besral Besral, Milla Herdayati, Revati Phalkey; J Prev Med Public Health. 2022;55(6):559-567. Published online November 13, 2022; DOI: https://doi.org/10.3961/jpmph.22.316

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Abstract PDF Supplementary Material

Objectives
This study aimed to assess the effect of complete coverage and content of available antenatal care (ANC) on the incidence of low birth weight (LBW) in 4 countries belonging to the Association of Southeast Asian Nations (ASEAN).
Methods
Measures of complete coverage and content of ANC services included the frequency of ANC visits and the seven service components (blood pressure measurement, iron supplementation, tetanus toxoid immunization, explanations of pregnancy complications, urine sample test, blood sample test, and weight measurement). The complete coverage and content of ANC services were assessed as high if more than 4 ANC visits and all seven components were delivered. Multivariable logistic regression with complex survey designs was conducted using Demographic Health Survey data from the 4 ASEAN countries in question from 2014 to 2017.
Results
The proportion of LBW infants was higher in the Philippines (13.8%) than in Indonesia (6.7%), Cambodia (6.7%), or Myanmar (7.5%). Poor ANC services were associated with a 1.30 times higher incidence of LBW than a high level of complete coverage and content of ANC services (adjusted odds ratio [aOR], 1.30; 95% confidence interval [CI], 1.11 to 1.52). In addition, the risk of LBW was higher in the Philippines than in other countries (aOR, 2.25; 95% CI, 2.01 to 2.51) after adjusting for mothers’ demographic/socioeconomic factors, health behaviors, and other factors.
Conclusions
In sum, complete coverage and content of ANC services were significantly associated with the incidence of LBW in Indonesia, Cambodia, and Myanmar. The Philippines did not show statistically significant results for this relationship, but had a higher risk of LBW with poor ANC.

Summary

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Scoping Review of Health Care–Seeking Behavior and Antenatal Care Visits Among Pregnant Adolescents in Low- and Middle-Income Countries
Siti Khuzaiyah, Khadizah Haji Abdul-Mumin, Sarena Haji Hashim
Nursing for Women's Health.2026;[Epub] CrossRef
Frequency of Low Birth Weight Neonates in Mothers with Low Serum Ferritin Levels
Samra Khan, Falak Naz Baloch, Rabia Bosan, Aiman Khan, Muneeba Khan, Zakir Ali Punar, Zobia Munaf
Pakistan Journal of Health Sciences.2025; : 60. CrossRef
Factors Associated With Low Birth Weight Among Under‐Five Children in Sub‐Saharan Africa: Evidence From Demographic and Health Surveys of 58,857 Children
Sulaimon T. Adedokun, Sanni Yaya
Health Science Reports.2025;[Epub] CrossRef
Synergistic associations of antenatal care visits and iron-folic acid supplementation with low birth weight: a pooled analysis of national surveys from six south Asian countries
Vishnu Khanal, Sangita Bista, Shiva Raj Mishra
BMC Public Health.2024;[Epub] CrossRef
The association of Chinese and American antenatal care utilization indices with birth outcomes
Haibo Zhou, Yi Yang, Peihan Chi, Haoyue Cheng, Xialidan Alifu, Yiwen Qiu, Ye Huang, Libi Zhang, Diliyaer Ainiwan, Yan Zhuang, Hui Liu, Zhi Chen, Yunxian Yu
Frontiers in Public Health.2024;[Epub] CrossRef
Relationship of sociodemographic factors and low birth weight in toddlers
Nikmatur Rohmah, Indah Wulandari, Agil Khoironi Firdaus, Nabilah Auliya, Novannisa Imanda, Dwi Ningtyas Anggraini
Frontiers of Nursing.2024; 11(4): 479. CrossRef
Effect of the enhancing nutrition and antenatal infection treatment (ENAT) intervention on birth weight in Ethiopia: a cluster randomized controlled trial
Y Mekonnen, E Wolde, A Bekele, Z Mehari, S Abebe, T Hagos, Y Tadesse, T Taye, G Asire, T Nigatu, S Kumar, S Girma, M Salasibew
BMC Pregnancy and Childbirth.2023;[Epub] CrossRef
Compliance with the World Health Organization’s 2016 prenatal care contact recommendation reduces the incidence rate of adverse birth outcomes among pregnant women in northern Ghana
Leticia Achangebe Akum, Eunice Amina Offei, Mary Rachael Kpordoxah, Daudi Yeboah, Abdul-Nasir Issah, Michael Boah, Sanjoy Kumer Dey
PLOS ONE.2023; 18(6): e0285621. CrossRef

Analysis of Differences in Preterm Birth Rates According to Household Occupation in Japan From 2007 to 2019: Tasuku Okui, Naoki Nakashima; J Prev Med Public Health. 2022;55(4):371-378. Published online June 20, 2022; DOI: https://doi.org/10.3961/jpmph.22.178

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Abstract PDF

Objectives
No studies have examined the association between preterm birth rates and socioeconomic factors in Japan using nationwide statistical data. We analyzed the association between preterm birth rates and household occupation using Vital Statistics data.
Methods
Aggregated Vital Statistics data from Japan from 2007 to 2019 were obtained from the Ministry of Health, Labour and Welfare. From the data, the number of births according to year, age group, gestational period, number of pregnancies, and household occupation were used in this study. Crude preterm birth rates and preterm birth rates adjusted by maternal age according to household occupation were calculated for each year. Poisson regression analysis was conducted to evaluate the association between household occupation and preterm births.
Results
Unemployed households had the highest preterm birth rate, and households with an occupation classification of “full-time worker 2” (an employee at a large company, civil servant, or board member) had the lowest preterm birth rate throughout each period. Poisson regression analysis revealed that unemployed households were statistically significantly associated with a high preterm birth risk. In contrast, the preterm birth rate adjusted by maternal age remained stable throughout each period regardless of household occupation, and preterm birth rates were found not to have increased in recent years in Japan.
Conclusions
Unemployed households had higher preterm birth rates than other household occupations. Further studies investigating the characteristics of unemployed households are needed to identify the reasons for this disparity.

Summary

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Maternal occupation and risk of adverse fetal outcomes in Tanzania: A hospital-based cross-sectional study
Baldwina Tita Olirk, Aiwerasia Vera Ngowi, Furaha August, Ezra Jonathan Mrema, Jovine Bachwenkizi, Simon Henry Mamuya, Kahsu Gebrekidan
PLOS ONE.2025; 20(3): e0319653. CrossRef
Shotgun metagenomics of the vaginal microbiome in cervical shortening and preterm birth risk
Keun-Young Lee, Seung-Ho Shin, Goeun Park, Shin-Hae Kang, Hyun-Jung Kang, Jiye Kim, Jae Jun Lee, Ga-Hyun Son, Ji Young Hong
Scientific Reports.2025;[Epub] CrossRef
Establishment and validation of clinical prediction models for preterm birth in patients with intrahepatic cholestasis of pregnancy: Single-center retrospective observational study
Min Wen, Wenfei Zheng, Mengmeng Yu
Medicine.2025; 104(52): e46848. CrossRef
Analysis of an Association between Preterm Birth and Parental Educational Level in Japan Using National Data
Tasuku Okui
Children.2023; 10(2): 342. CrossRef
Association of maternal nationality with preterm birth and low birth weight rates: analysis of nationwide data in Japan from 2016 to 2020
Tasuku Okui, Yoko Sato, Seiichi Morokuma, Naoki Nakashima
Maternal Health, Neonatology and Perinatology.2023;[Epub] CrossRef
Does the father’s job matter? Parental occupation and preterm birth in Korea
Taemi Kim, Eunseon Gwak, Bolormaa Erdenetuya, Jeong-Won Oh, Jung-won Yoon, Myoung-Hee Kim, Jia Ryu, Seung-Ah Choe
Epidemiology and Health.2023; 45: e2023078. CrossRef

Adverse Birth Outcomes Among Pregnant Women With and Without COVID-19: A Comparative Study From Bangladesh: Sumaya Binte Masud, Faiza Zebeen, Dil Ware Alam, Mosharap Hossian, Sanjana Zaman, Rowshan Ara Begum, Mohammad Hayatun Nabi, Mohammad Delwer Hossain Hawlader; J Prev Med Public Health. 2021;54(6):422-430. Published online October 21, 2021; DOI: https://doi.org/10.3961/jpmph.21.432

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Abstract PDF

Objectives
Pregnant women are especially vulnerable to respiratory infections such as coronavirus disease 2019 (COVID-19), but insufficient research has investigated pregnancy and its outcomes in women with COVID-19. This cross-sectional study compared birth outcomes related to COVID-19 between Bangladeshi pregnant women with and without COVID-19.
Methods
The study was conducted at 3 tertiary referral hospitals in Dhaka, Bangladesh, from March to August 2020. Pregnant women admitted for delivery at these hospitals with laboratory results (reverse-transcription polymerase chain reaction) were analyzed. Using convenience sampling, we included 70 COVID-19-positive and 140 COVID-19-negative pregnant women. Trained and experienced midwives conducted the interviews. Data were analyzed using the t-test, the chi-square test, and univariate and multivariable linear and logistic regression.
Results
Pregnant women with COVID-19 were more likely to give birth to a preterm baby (adjusted odds ratio [aOR], 2.15; 95% confidence interval [CI], 1.06 to 4.37) and undergo a cesarean section (aOR, 3.27; 95% CI, 1.51 to 7.07). There were no significant differences in birth weight, premature rupture of membranes, and the Apgar score at 1 minute or 5 minutes post-delivery between women with and without COVID-19. All the newborn babies who were born to COVID-19-positive women were COVID-19-negative.
Conclusions
Our study suggests that pregnant women with COVID-19 were more likely to give birth to a preterm baby and undergo a cesarean section. For this reason, physicians should be particularly cautious to minimize adverse birth outcomes among pregnant women with COVID-19 and their newborn babies.

Summary

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Preterm Birth and SARS-CoV-2: Does a Correlation Exist?
Federica Perelli, Annalisa Vidiri, Giovanna Palomba, Rita Franco, Vitalba Gallitelli, Marco Parasiliti, Marta Bisanti, Amelia Spanò, Adele Silvagni, Alessandra Lopez, Giuseppe Gullo, Gaspare Cucinella, Anna Franca Cavaliere
Biomedicines.2025; 13(2): 282. CrossRef
Neonatal outcomes among pregnant women with COVID-19: a systematic scoping review and meta-analysis
Yongqiu Li, Ying Lu, Huilin Tang, Eliot A. Spector, Xiaoxiao Wen, Kimberly Germinal, Alexandra Milfort, Yi Guo, Sarah Bost, Elizabeth Shenkman, Jiang Bian, Hui Hu, Jingchuan Guo
BMC Pregnancy and Childbirth.2025;[Epub] CrossRef
SARS-CoV-2 infection by trimester of pregnancy and adverse perinatal outcomes: a Mexican retrospective cohort study
Rakesh Ghosh, Juan Pablo Gutierrez, Iván de Jesús Ascencio-Montiel, Arturo Juárez-Flores, Stefano M Bertozzi
BMJ Open.2024; 14(4): e075928. CrossRef
The impact of COVID-19 infections on pregnancy outcomes in women
Ke Xu, Wen Sun, Shuangshuang Yang, Tianqi Liu, Ning Hou
BMC Pregnancy and Childbirth.2024;[Epub] CrossRef
COVID-19 vaccine decision-making among pregnant and lactating women in Bangladesh
Rupali J. Limaye, Prachi Singh, Alicia Paul, Berhaun Fesshaye, Clarice Lee, Eleonor Zavala, Sydney Wade, Hasmot Ali, Hafizur Rahman, Shirina Akter, Ruth Karron, Towfida Jahan Siddiqua
Vaccine.2023; 41(26): 3885. CrossRef
The coronavirus disease 2019 infection in pregnancy and adverse pregnancy outcomes: a systematic review and meta-analysis
Yeonsong Jeong, Min-A Kim
Obstetrics & Gynecology Science.2023; 66(4): 270. CrossRef
Sources of COVID-19 Vaccine Promotion for Pregnant and Lactating Women in Bangladesh
Berhaun Fesshaye, Sydney A. Wade, Clarice Lee, Prachi Singh, Eleonor Zavala, Hasmot Ali, Hafizur Rahman, Towfida Jahan Siddiqua, Shirina Atker, Ruth A. Karron, Rupali J. Limaye
Vaccines.2023; 11(8): 1387. CrossRef
Impact of SARS-CoV-2 infection in pregnant women and their babies: clinical and epidemiological features
María José Vidal, Èrica Martínez-Solanas, Sergi Mendoza, Núria Sala, Mireia Jané, Jacobo Mendioroz, Pilar Ciruela
Gaceta Sanitaria.2023; 37: 102332. CrossRef
An outbreak of infection due to severe acute respiratory corona virus-2 in a neonatal unit from a low and middle income setting
Firdose Lambey Nakwa, Reenu Thomas, Alison van Kwawegen, Nandi Ntuli, Karabo Seake, Samantha Jane Kesting, Noela Holo Bertha Kamanga, Dikeledi Maureen Kgwadi, Neema Chami, Tshiamo Mogajane, Claude Ondongo-Ezhet, Thulisile Nelly Maphosa, Stephanie Jones, V
Frontiers in Pediatrics.2022;[Epub] CrossRef

Daytime Napping and Nighttime Sleep During Pregnancy and Preterm Birth in Iran: Farnaz Shaliha, Maryam Mozaffari, Faeze Ramezani, Hamideh Hajnasiri, Farnoosh Moafi; J Prev Med Public Health. 2021;54(3):182-189. Published online March 31, 2021; DOI: https://doi.org/10.3961/jpmph.20.372

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Abstract PDF

Objectives
This study investigated the relationship between sleep quality during pregnancy and preterm birth.
Methods
This longitudinal study was conducted between August 2018 and May 2019. The participants were 150 pregnant women who had been referred to 7 healthcare centers in the city of Qazvin, Iran and met the inclusion criteria. The Petersburg Sleep Quality Index, the Epworth Sleepiness Scale, and 2 questions about daytime sleep status and a demographic questionnaire were administered at 14-18 weeks and 28-32 weeks of gestation. Data were analyzed using the Mann-Whitney test, the Fisher exact test, and univariate and multivariable logistic regression.
Results
In the present study, poor sleep quality affected 84.7% of the participants at 14-18 weeks and 93.3% at 28-32 weeks of gestation. The final model for preterm birth prediction incorporated age and the Petersburg Sleep Quality Index score in the second and third trimesters. Preterm birth increased by 14% with each unit increase in age. With each unit increase in the Petersburg Sleep Quality Index score in the second and third trimesters, preterm birth increased by 42% and 28%, respectively, but the p-values of these factors were not significant.
Conclusions
Although a significant percentage of pregnant women had poor sleep quality, no significant relationship was found between sleep quality during pregnancy and preterm birth.

Summary

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Ee Yin Kok, Satvinder Kaur, Nurul Husna Mohd Shukri, Nurliyana Abdul Razak, Masaki Takahashi
BMC Pregnancy and Childbirth.2024;[Epub] CrossRef
Association between sleep quality with maternal and neonatal outcomes during the covid-19 pandemic
Maryam Akbari, Sara EsmaeilzadehSaeieh, Malihe Farid, Arman Shafiee, Mahmood Bakhtiyari, Touran Bahrami Babaheidari, Mansoureh Yazdkhasti
BMC Pregnancy and Childbirth.2024;[Epub] CrossRef
Sleep duration, napping behaviors and restless legs syndrome during pregnancy and the trajectories of ultrasonographic measures of fetal growth: Findings from the NICHD Fetal Growth Studies–Singletons
Muzi Na, Samidha Sudhakar Shetty, Xiaoyue Niu, Stefanie N. Hinkle, Cuilin Zhang, Xiang Gao
Sleep Health.2024; 10(4): 462. CrossRef
Managing Maternal Fatigue During Childbirth: A Systematic Review
Kunnikar Chaisitsanguan, Puangpaka Kongwattananon, Dawn Hawthrone
Current Women s Health Reviews.2023;[Epub] CrossRef
Studying the Sleep Quality of First Pregnant Women in the Third Trimester of Pregnancy and Some Factors Related to It
Moude Liu, Qin Tang, Qing Wang, Weixi Xie, Jinbao Fan, Siyuan Tang, Wei Liu, Yingjun Zhou, Xu Deng
Journal of Integrative Nursing and Palliative Care.2022; 1(1): 18. CrossRef

Birth Patterns and Delayed Breastfeeding Initiation in Indonesia: Tika Dwi Tama, Erni Astutik, Septa Katmawanti, Jauhari Oka Reuwpassa; J Prev Med Public Health. 2020;53(6):465-475. Published online October 26, 2020; DOI: https://doi.org/10.3961/jpmph.20.212

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Abstract PDF

Objectives
This study was conducted to examine the association between birth patterns (defined in terms of birth order and interval) with delayed breastfeeding initiation in Indonesia. Methods: A cross-sectional study was carried out using data from the Indonesian Demographic and Health Survey 2017. The weighted number of respondents was 5693 women aged 15-49 years whose youngest living child was less than 2 years old. Multivariable logistic regression was conducted to evaluate associations between birth patterns and delayed breastfeeding initiation after adjusting for other covariates. Results: This study found that 40.2% of newborns in Indonesia did not receive timely breastfeeding initiation. Birth patterns were significantly associated with delayed breastfeeding initiation. Firstborn children had 77% higher odds of experiencing delayed breastfeeding initiation (adjusted odds ratio, 1.77; 95% confidence interval, 1.02 to 3.04; p<0.05) than children with a birth order of 4 or higher and a birth interval ≤ 2 years after adjusting for other variables. Conclusions: Firstborn children had higher odds of experiencing delayed breastfeeding initiation. Steps to provide a robust support system for mothers, especially first-time mothers, such as sufficient access to breastfeeding information, support from family and healthcare providers, and national policy enforcement, will be effective strategies to ensure better practices regarding breastfeeding initiation.

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Septa Katmawanti, Farah Paramita, Agung Kurniawan, Siti Khuzaimah A. Sharoni, Rosuzeita Fauzi, Dea Aflah Samah, Yassinda Thasia Audina, Muhammad Irfan Syahputra, Reza Pahlevi, Intan Gumilang Pratiwi
Healthcare in Low-resource Settings.2024;[Epub] CrossRef
Associated Factors of Early Breastfeeding Initiation and Exclusive Breastfeeding in South Africa: Evidence From the South African Demographic and Health Survey
Azeez Adeboye
Epidemiology and Health System Journal.2024; 11(1): 13. CrossRef
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Samuel Hailegebreal, Yosef Haile, Binyam Tariku Seboka, Ermias Bekele Enyew, Tamiru Shibiru, Zeleke Abebaw Mekonnen, Shegaw Anagaw Mengiste, James Mockridge
PLOS ONE.2022; 17(9): e0273793. CrossRef
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Febrianti Prasmono Putri, Septa Katmawanti, Erianto Fanani
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Sirajuddin, Saifuddin Sirajuddin, Amran Razak, Ansariadi, Ridwan M Thaha, Toto Sudargo
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Effects of Socio-demographic Factors on the Decreasing Trend in the Sex Ratio at Birth in Korea, 1997-2017: Jisuk Bae; J Prev Med Public Health. 2020;53(5):371-380. Published online August 7, 2020; DOI: https://doi.org/10.3961/jpmph.20.282

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Abstract PDF Supplementary Material: Objectives
This study investigated the effects of socio-demographic factors on the decreasing trend in the sex ratio at birth from 1997 to 2017 in Korea.
Methods
Data from 10 349 602 live births registered with Statistics Korea from 1997 to 2017 were analyzed. The secondary sex ratio (SSR), defined as the ratio of male to female live births, during the study period (1997-1999 [phase I], 2000-2002 [phase II], 2003-2005 [phase III], 2006-2008 [phase IV], 2009-2011 [phase V], 2012-2014 [phase VI], and 2015-2017 [phase VII]) was calculated according to selected socio-demographic factors, such as parental age, education, occupation, and birth order. Logistic regression models were used to estimate odds ratios (ORs) and 95% confidence intervals for a male birth after adjusting for potential confounders.
Results
The SSR gradually decreased from 1.10 (in 1998-2000 and 2002) to 1.05 (in 2013-2016). While a decreasing trend in the SSR was not noted among first births, male-biased sex ratios were prominent among third and higher-order births, for which the highest SSR was 1.46 in 1998. Higher birth order was significantly associated with an excess of male births in phases I-VI (≥third vs. first, OR range, 1.03 to 1.35). Advanced maternal age was significantly associated with an excess of female births in phases II, III, and V (≥40 vs. 20-24 years, OR range, 0.92 to 0.95).
Conclusions
This study demonstrated that advanced maternal age and reduction of the artificially-biased SSR among third and higher-order births may partially explain the decreasing trend in the SSR from 1997 to 2017 in Korea.; Summary

Factors Associated With Stillbirth Among Pregnant Women in Nepal: Mahesh Bhusal, Nirmal Gautam, Apiradee Lim, Phattrawan Tongkumchum; J Prev Med Public Health. 2019;52(3):154-160. Published online April 24, 2019; DOI: https://doi.org/10.3961/jpmph.18.270

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Objectives
Stillbirth is a common adverse pregnancy outcome that represents a distressing and traumatic event for women and their partners. The aim of this study was to identify factors associated with stillbirth in ever-pregnant women in Nepal.
Methods
This study utilized the individual women’s dataset from the Nepal Demographic and Health Survey, conducted in 2016. The dependent variable of interest was whether women had at least 1 stillbirth during their lifetime. The associations between independent variables and the dependent variable of the study were analyzed using a multiple logistic regression model.
Results
Among 8918 ever-pregnant women aged 15-49 years, 488 had experienced at least 1 stillbirth during their lifetime, representing 5.5% of the total. After adjusting each factor for the confounding effects of other factors, maternal age, maternal education, place of residence, and sub-region remained significantly associated with having experienced stillbirth.
Conclusions
Stillbirth continues to be a major problem among women, especially those with higher maternal age, those who are illiterate, and residents of certain geographical regions. To minimize stillbirth in Nepal, plans and policies should be focused on women with low education levels and residents of rural areas, especially in the western mountain and far-western hill regions.

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P. R. S. Rodrigues, R. Milton, F. Modibbo, D. Gillespie, F. I. Alkali, A. S. Mukaddas, A. Kassim, F. H. Sa’ad, F. M. Tukur, R. Y. Khalid, M. Y. Muhammad, M. Bello, C. P. Edwin, E. Ogudo, U. Unsal, W. J. Watkins, S. Edkins, M. Craigon, E. Parkinson, C. Smi
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Mohammad Torkashvand Moradabadi, Nahid Ardian, Seyed Saeed Mazloomy-Mahmoodabad, Tahmineh Farajkhoda, Nooshin Yoshani, Seyed Alireza Afshani, Deepak Paliwal
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Impact of Changes in Maternal Age and Parity Distribution on the Increasing Trends in the Low Birth Weight and Very Low Birth Weight Rates in South Korea, 2005-2015: Yujin Oh, Jisuk Bae; J Prev Med Public Health. 2019;52(2):123-130. Published online March 14, 2019; DOI: https://doi.org/10.3961/jpmph.18.247

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Abstract Summary PDF

Objectives
The aim of this study was to evaluate the impact of shifts in maternal age and parity on the increasing trends in the low birth weight (LBW) and very low birth weight (VLBW) rates from 2005 to 2015 in South Korea.
Methods
Data from 4 993 041 live births registered with Statistics Korea during the period between 2005 and 2015 were analyzed. Applying a modified standardization method, we partitioned the total increment in the LBW and VLBW rates into (1) the increase in the LBW and VLBW rates due to changes in the maternal age and parity distribution (AP-dis) and (2) the increase due to changes in the age-specific and parity-specific rates (AP-spe) of LBW and VLBW for singleton and multiple births, respectively.
Results
During the study period, the total increment in the LBW and VLBW rates was 1.43%p and 0.25%p, respectively. Among singleton births, changes in the AP-dis accounted for 79% (0.34%p) and 50% (0.06%p) of the total increment in the LBW and VLBW rates, respectively. Meanwhile, among multiple births, changes in the AP-dis did not contribute to the increase in the LBW and VLBW rates, with 100% of the increase in the LBW (1.00%p) and VLBW (0.13%p) rates being attributed to changes in the AP-spe.
Conclusions
This study demonstrated that shifts in maternal age and parity were prominent contributors to the increase in the LBW and VLBW rates among singleton births between 2005 and 2015 in South Korea.

Summary

Korean summary
우리나라 출생자료를 이용하여 2005년부터 2015년까지 한국인 저출생체중아 및 극소저출생체중아 발생률 증가에서 1) 산모연령 및 출산순위 분포변화에 기인하는 부분과 2) 이들 분포변화 이외의 요인에 기인하는 부분을 수정된 표준화법을 적용하여 평가하였다. 분석 결과, 단태아에서 저출생체중아 발생률 증가량의 79% (0.34%p), 극소저출생체중아 발생률 증가량의 50% (0.06%p)가 산모연령 및 출산순위 분포변화에 기인한 것으로 나타났다. 반면, 다태아에서는 저출생체중아 및 극소저출생체중아 발생률 증가량의 100% (저출생체중아 1.00%p, 극소저출생체중아 0.13%p)가 이들 분포변화 이외의 요인에 기인한 것으로 나타났다.

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Risk Reduction of Breast Cancer by Childbirth, Breastfeeding, and Their Interaction in Korean Women: Heterogeneous Effects Across Menopausal Status, Hormone Receptor Status, and Pathological Subtypes: Seok Hun Jeong, Yoon Suk An, Ji-Yeob Choi, Boyoung Park, Daehee Kang, Min Hyuk Lee, Wonshik Han, Dong Young Noh, Keun-Young Yoo, Sue K. Park; J Prev Med Public Health. 2017;50(6):401-410. Published online November 10, 2017; DOI: https://doi.org/10.3961/jpmph.17.152

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Abstract PDF Supplementary Material

Objectives
The purpose of this study was to examine the associations of childbirth, breastfeeding, and their interaction with breast cancer (BC) risk reduction, and to evaluate the heterogeneity in the BC risk reduction effects of these factors by menopause, hormone receptor (HR) status, and pathological subtype.
Methods
BC patients aged 40+ from the Korean Breast Cancer Registry in 2004-2012 and controls from the Health Examinee cohort participants were included in this study after 1:1 matching (12 889 pairs) by age and enrollment year. BC risk according to childbirth, breast-feeding, and their interaction was calculated in logistic regression models using odds ratios (ORs) and 95% confidence intervals (CIs).
Results
BC risk decreased with childbirth (3+ childbirths relative to 1 childbirth: OR, 0.66; 95% CI, 0.56 to 0.78 and OR, 0.80; 95% CI, 0.68 to 0.95 in postmenopausal and premenopausal women, respectively); and the degree of risk reduction by the number of children was heterogeneous according to menopausal status (p-heterogeneity=0.04), HR status (p-heterogeneity<0.001), and pathological subtype (p-heterogeneity<0.001); whereas breastfeeding for 1-12 months showed a heterogeneous association with BC risk according to menopausal status, with risk reduction only in premenopausal women (p-heterogeneity<0.05). The combination of 2 more childbirths and breastfeeding for ≥13 months had a much stronger BC risk reduction of 49% (OR, 0.51; 95% CI, 0.45 to 0.58).
Conclusions
This study suggests that the combination of longer breastfeeding and more childbirths reduces BC risk more strongly, and that women who experience both 2 or more childbirths and breastfeed for ≥13 months can reduce their BC risk by about 50%.

Summary

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Distribution and Determinants of Low Birth Weight in Developing Countries: Rashidul Alam Mahumud, Marufa Sultana, Abdur Razzaque Sarker; J Prev Med Public Health. 2017;50(1):18-28. Published online December 27, 2016; DOI: https://doi.org/10.3961/jpmph.16.087

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Abstract PDF

Objectives
Low birth weight (LBW) is a major public health concern, especially in developing countries, and is frequently related to child morbidity and mortality. This study aimed to identify key determinants that influence the prevalence of LBW in selected developing countries.
Methods
Secondary data analysis was conducted using 10 recent Demography and Health Surveys from developing countries based on the availability of the required information for the years 2010 to 2013. Associations of demographic, socioeconomic, community-based, and individual factors of the mother with LBW in infants were evaluated using multivariate logistic regression analysis.
Results
The overall prevalence of LBW in the study countries was 15.9% (range, 9.0 to 35.1%). The following factors were shown to have a significant association with the risk of having an LBW infant in developing countries: maternal age of 35 to 49 years (adjusted odds ratio [aOR], 1.7; 95% confidence interval [CI], 1.2 to 3.1; p<0.01), inadequate antenatal care (ANC) (aOR, 1.7; 95% CI, 1.1 to 2.8; p<0.01), illiteracy (aOR, 1.5; 95% CI, 1.1 to 2.7; p<0.001), delayed conception (aOR, 1.8; 95% CI, 1.4 to 2.5; p<0.001), low body mass index (aOR, 1.6; 95% CI, 1.2 to 2.1; p<0.001) and being in the poorest socioeconomic stratum (aOR, 1.4; 95% CI, 1.1 to 1.8; p<0.001).
Conclusions
This study demonstrated that delayed conception, advanced maternal age, and inadequate ANC visits had independent effects on the prevalence of LBW. Strategies should be implemented based on these findings with the goal of developing policy options for improving the overall maternal health status in developing countries.

Summary

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Risk Factors for Preterm Birth and Low Birth Weight Among Pregnant Indian Women: A Hospital-based Prospective Study: Chaitanya Tellapragada, Vandana Kalwaje Eshwara, Parvati Bhat, Shashidhar Acharya, Asha Kamath, Shashikala Bhat, Chythra Rao, Sathisha Nayak, Chiranjay Mukhopadhyay; J Prev Med Public Health. 2016;49(3):165-175. Published online May 31, 2016; DOI: https://doi.org/10.3961/jpmph.16.022

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Abstract PDF

Objectives
The present study was undertaken to study the maternal risk factors for preterm birth (PTB) and low birth weight (LBW) with a special emphasis on assessing the proportions of maternal genitourinary and periodontal infections among Indian women and their association with adverse pregnancy outcomes.
Methods
A hospital-based prospective study comprising 790 pregnant women visiting the obstetrics clinic for a routine antenatal check-up was undertaken. Once recruited, all study participants underwent clinical and microbiological investigations for genitourinary infections followed by a dental check-up for the presence of periodontitis. The study participants were followed up until their delivery to record the pregnancy outcomes. Infectious and non-infectious risk factors for PTB and LBW were assessed using univariate and multivariate Cox regression analysis. Independent risk factors for PTB and LBW were reported in terms of adjusted relative risk (ARR) with the 95% confidence interval (CI).
Results
Rates of PTB and LBW in the study population were 7.6% and 11.4%, respectively. Previous preterm delivery (ARR, 5.37; 95% CI, 1.5 to 19.1), periodontitis (ARR, 2.39; 95% CI, 1.1 to 4.9), Oligohydramnios (ARR, 5.23; 95% CI, 2.4 to 11.5), presence of Nugent’s intermediate vaginal flora (ARR, 2.75; 95% CI, 1.4 to 5.1), gestational diabetes mellitus (ARR, 2.91; 95% CI, 1.0 to 8.3), and maternal height <1.50 m (ARR, 2.21; 95% CI, 1.1 to 4.1) were risk factors for PTB, while periodontitis (ARR, 3.38; 95% CI, 1.6 to 6.9), gestational hypertension (ARR, 3.70; 95% CI, 1.3 to 10.8), maternal height <1.50 m (ARR, 2.66; 95% CI, 1.3 to 5.1) and genital infection during later stages of pregnancy (ARR, 2.79; 95% CI, 1.2 to 6.1) were independent risk factors for LBW.
Conclusions
Our study findings underscore the need to consider screening for potential genitourinary and periodontal infections during routine antenatal care in developing countries.

Summary

Citations

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Changes in the Distribution of Maternal Age and Parity and Increasing Trends in the Low Birth Weight Rate in Korea Between 1995 and 2005: Jisuk Bae, Jung Han Park, Yoo Keun Park, Jong-Yeon Kim, Sang-Won Lee, Soon-Woo Park; J Prev Med Public Health. 2011;44(3):111-117. Published online May 17, 2010; DOI: https://doi.org/10.3961/jpmph.2011.44.3.111

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Abstract PDF

Objectives

This study measured the impact of shifts in maternal age and parity on the increase in the low birth weight (LBW) rate in Korea.

Methods

We obtained raw data for all 6 397 945 live births registered at the Korea National Statistical Office between 1995 and 2005. We calculated the proportion of increment in the LBW rate due to changes in the distribution of maternal age and parity (AP-dis) and the proportion due to changes in the age- and parity-specific LBW rate (AP-spe).

Results

The LBW rate increased from 3.02% in 1995 to 4.28% in 2005. The multiple birth rate increased from 1.32% to 2.19% during the same period. Of the 1.26% points increment in the LBW rate, 0.64% points occurred among singleton births and 0.62% points occurred among multiple births. Changes in the AP-dis accounted for 50% of the increase in the LBW rate among singleton births, but did not contribute to the increase in the LBW rate among multiple births. The remainder of the total increment in the LBW rate was explained by the increase in the AP-spe.

Conclusions

This study demonstrated that shifts in maternal age and parity among singleton births and increased multiple births were important contributors to the increment in the LBW rate. This study also revealed that the increase in the AP-spe was an equally important contributor as the shifts in maternal age and parity to the increment in the LBW rate among singleton births and was a major contributor among multiple births.

Summary

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Investigative Opthalmology & Visual Science.2020; 61(10): 14. CrossRef
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Placental Superoxide Dismutase, Genetic Polymorphism, and Neonatal Birth Weight.: Yun Chul Hong, Kwan Hee Lee, Moon Whan Im, Young Ju Kim, Eun Hee Ha; J Prev Med Public Health. 2004;37(4):306-311. Published online November 30, 2004

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Abstract PDF: BACKGROUND
The roles of antioxidants in the placenta and genetic susceptibility to oxidant chemicals in relation to neonatal birth weight have not been elucidated. We determined whether the level of placental manganese superoxide dismutase (MnSOD) and its genetic polymorphism plays any role in oxidative stress and neonatal birth weight. METHODS: We measured placental MnSOD and determined MnSOD genetic polymorphism among 108 pregnant women who were hospitalized for delivery and their singleton live births in Korea. Main outcome measurements are maternal urinary malondialdehyde (MDA) and birth weight. RESULTS: Maternal urinary concentrations of MDA were significantly associated with neonatal birth weight (P=0.04). The enzyme level of placental MnSOD was also significantly associated with MDA concentration (P=0.04) and neonatal birth weight (P< 0.01). We observed dose-response relationships between placental MnSOD and maternal urinary MDA, and neonatal birth weight after adjusting for maternal weight, height, age, and neonatal sex. After controlling for covariates, MnSOD variant genotype increased maternal urinary MDA concentrations (P< 0.01) and reduced birth weight by 149 gm (P=0.08). CONCLUSIONS: This study demonstrates that the placental level of MnSOD during pregnancy significantly affects fetal growth by reducing oxidative stress, and that genetic polymorphism of MnSOD probably modulate the effects of oxidants on fetal growth.; Summary

Prenatal Exposure to PM10 and Preterm Birth between 1998 and 2000 in Seoul, Korea.: Eun Hee Ha, Bo Eun Lee, Hye Sook Park, Yun Sang Kim, Ho Kim, Young Ju Kim, Yun Chul Hong, Eun Ae Park; J Prev Med Public Health. 2004;37(4):300-305. Published online November 30, 2004

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Abstract PDF: OBJECTIVES
The exposure to particulate air pollution during the pregnancy has reported to result in adverse pregnancy outcome such as low birth weight, preterm birth, still birth, and intrauterine growth retardation (IUGR). We aim to assess whether prenatal exposure of particulate matter less than 10 (m in diameter (PM10) is associated with preterm birth in Seoul, South Korea. METHODS: We included 382, 100 women who delivered a singleton at 25-42 weeks of gestation between 1998 and 2000. We calculated the average PM10 exposures for each trimester period and month of pregnancy, from the first to the ninth months, based on the birth date and gestational age. We used three different models to evaluate the effect of air pollution on preterm birth; the logistic regression model, the generalized additive logistic regression model, and the proportional hazard model. RESULTS: The monthly analysis using logistic regression model suggested that the risks of preterm birth increase with PM10 exposure between the sixth and ninth months of pregnancy and the highest risk was observed in the seventh month (adjusted odds ratio=1.07, 95% CI=1.01- 1.14). We also found the similar results using generalized additive model. In the proportional hazard model, the adjusted odds ratio for preterm births due to PM10 exposure of third trimester was 1.04 (95% CI=0.96-1.13) and PM10 exposure between the seventh month and ninth months of pregnancy was associated with the preterm births. CONCLUSIONS: We found that there were consistent results when we applied the three different models. These findings suggest that air pollution exposure during the third trimester pregnancy has an adverse effect on preterm birth in South Korea.; Summary

Review

Air Pollution Exposure and Health Effects in Fetus.: Bo Eun Lee, Hye sook Park, Young Ju Kim, Eun Ae Park, Yun Chul Hong, Eun Hee Ha; J Prev Med Public Health. 2004;37(4):291-299. Published online November 30, 2004

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Abstract PDF: As there have been growing concerns about the adverse effects of air pollution on birth outcome, studies for this area has been carried out in different populations and sites. We reviewed the epidemiologic studies that evaluated the effects of air pollution on birth outcome such as low birth weight and preterm births. We identified the air pollution exposure during pregnancy was related with low birth weight and preterm birth, although there are differences among studies for the critical period of vulnerability. The biological mechanisms whereby air pollution might influence health of fetus are not clearly established. The exposure to carbon monoxide (CO) during pregnancy could increase fetal carboxyhemoglobin and result in tissue hypoxia. On the other hand, ambient particles less than 10 micrometer in aerodynamic diameter (PM10) could lead to inflammation and increase blood viscosity. Controlling for potential confounders and valid assessment of exposure are the methodological issues remained in these epidemiologic studies. In the future, more studies are needed to investigate the effect of air pollution on preterm birth or stillbirths, considering the various exposure period and the biological mechanism.; Summary

Comparative Study

Body Weight at Birth and at Age Three and Respiratory Illness in Preschool Children.: Yoolwon Jeong, Kyunghee Jung-Choi, Jin Hwa Lee, Hwa Young Lee, Eun Ae Park, Young Ju Kim, Eunhee Ha, Se Young Oh, Hyesook Park; J Prev Med Public Health. 2010;43(5):369-376.; DOI: https://doi.org/10.3961/jpmph.2010.43.5.369

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Abstract PDF

OBJECTIVES
The purpose of this study was to examine the associations of current body weight and body mass index (BMI) at age three and birth weight in developing chronic respiratory illness in childhood and identify possible interaction underlying its mechanism. METHODS: The study was carried out with 422 children who were enrolled in a hospital-based birth cohort. Birth related anthropometric data were collected at birth. At age 3 years, the presence of respiratory symptoms was evaluated by using the Korean version of core questionnaire for wheezing and asthma from the International Study of Asthma and Allergies in Childhood (ISAAC). Physical examination was carried out to measure the child's weight and height. RESULTS: Children in the lowest birth weight tertile (aOR = 3.97, 95% CI = 0.94-16.68) or highest BMI tertile (aOR = 3.68, 95% CI = 1.24-10.95) at three years of age were at an increased risk of chronic respiratory illness. Children who were initially in the lowest birth weight tertile but now belong in the highest weight tertile had higher risk of chronic respiratory illness compared to those who had remained in the middle tertile (OR=16.35, 95% CI=1.66-160.57). CONCLUSIONS: Children with lower birth weight or higher BMI were at an increased risk of chronic respiratory illness. In addition, children who were initially in the lowest birth weight tertile but are now in the highest weight tertile had higher risk of chronic respiratory illness compared to those who remained in the middle tertile.

Summary

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English Abstracts

Trends in Sex Ratio at Birth according to Parental Social Positions: Results from Vital Statistics Birth, 1981-2004 in Korea.: Heeran Chun, Il Ho Kim, Young Ho Khang; J Prev Med Public Health. 2009;42(2):143-150.; DOI: https://doi.org/10.3961/jpmph.2009.42.2.143

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Abstract PDF

OBJECTIVES
South Korea has experienced unprecedented ups and downs in the sex ratio at birth (SRB), which has been a unique phenomenon in the last two decades. However, little is known about socioeconomic factors that influence the SRB. Employing the diffusion theory by Rogers, this study was undertaken to examine the trends in social variations in the SRB from 1981 to 2004 in Korea. METHODS: The data was taken from Vital Birth Statistics for the period from 1981-2004. We computed the annual male proportion of live births according to the parental education (university, middle/high school, primary) and occupation (non-manual, manual, others). Logistic regression analysis was employed to estimate the odds ratios of male birth according to social position for the equidistant three time periods (1981-1984, 1991-1994, and 2001-2004). RESULTS: An increased SRB was detected among parents with higher social position before the mid 1980s. Since then, however, a greater SRB was found for the less educated and manual jobholders. The inverse social gradient for the SRB was most prominent in early 1990s, but the gap has narrowed since the late 1990s. The mother's socioeconomic position could be a sensitive indicator of the social variations in the sex ratio at birth. CONCLUSIONS: Changes in the relationship of parental social position with the SRB were detected during the 1980-2004 in Korea. This Korean experience may well be explained by diffusion theory, suggesting there have been socioeconomic differences in the adoption and spread of sex-detection technology.

Summary

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Environmental Health Surveillance of Low Birth Weight in Seoul using Air Monitoring and Birth Data.: Ju Hee Seo, Eun Hee Ha, Ok Jin Kim, Byung Mi Kim, Hye Sook Park, Jong Han Leem, Yun Chul Hong, Young Ju Kim; J Prev Med Public Health. 2007;40(5):363-370.; DOI: https://doi.org/10.3961/jpmph.2007.40.5.363

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Abstract PDF

OBJECTIVES
The principal objective of this study was to determine the relationship between maternal exposure to air pollution and low birth weight and to propose a possible environmental health surveillance system for low birth weight. METHODS: We acquired air monitoring data for Seoul from the Ministry of Environment, the meteorological data from the Korean Meteorological Administration, the exposure assessments from the National Institute of Environmental Research, and the birth data from the Korean National Statistical Office between January 1, 2002 and December 31, 2003. The final birth data were limited to singletons within 37~44 weeks of gestational age. We defined the Low Birth Weight (LBW) group as infants with birth weights of less than 2500g and calculated the annual LBW rate by district. The air monitoring data were measured for CO, SO2, NO2, and PM10 concentrations at 27 monitoring stations in Seoul. We utilized two models to evaluate the effects of air pollution on low birth weight: the first was the relationship between the annual concentration of air pollution and low birth weight (LBW) by individual and district, and the second involved a GIS exposure model constructed by Arc View 3.1. RESULTS: LBW risk (by Gu, or district) was significantly increased to 1.113(95% CI=1.111~1.116) for CO, 1.004 (95% CI=1.003~1.005) for NO2, 1.202(95% CI=1.199~ 1.206) for SO2, and 1.077(95% CI=1.075~1.078) for PM10 with each interquartile range change. Personal LBW risk was significantly increased to 1.081(95% CI=1.002~1.166) for CO, 1.145(95% CI=1.036~1.267) for SO2, and 1.053(95% CI=1.002~1.108) for PM10 with each interquartile range change. Personal LBW risk was increased to 1.003(95% CI=0.954~1.055) for NO2, but this was not statistically significant. The air pollution concentrations predicted by GIS positively correlated with the numbers of low birth weights, particularly in highly polluted regions. CONCLUSIONS: Environmental health surveillance is a systemic, ongoing collection effort including the analysis of data correlated with environmentally-associated diseases and exposures. In addition, environmental health surveillance allows for a timely dissemination of information to those who require that information in order to take effective action. GIS modeling is crucially important for this purpose, and thus we attempted to develop a GIS-based environmental surveillance system for low birth weight.

Summary

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Hyun-Jin Kim, Seok-Jun Yoon, Hyeong-Su Kim, Kun-Sei Lee, Eun-Jung Kim, Min-Woo Jo, In-Hwan Oh
Korean Journal of Environmental Health Sciences.2011; 37(5): 387. CrossRef

Original Articles

A Survey on Prenatal Environmental Risk Factors for Mothers of Low Birth Weight Infants in Asan-City.: Heeyoung Lee, Seok Jun Yoon, Hyungsik Ahn, Mina Ha, Kyung Sim Koh, Kyung Ja June; J Prev Med Public Health. 2004;37(1):11-16.

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Abstract PDF: OBJECTIVE
In this study, we aimed to produce basic data on the prenatal environmental risk factors of low birth weight infants at a community level. METHODS: In 2000, we conducted the direct interview using questionnaire about prenatal environmental risk factors with low birth weight infant-delivered mothers and normal weight infant-delivered mothers in Asan-city, Chungcheongnamdo Province, Korea. The questions given to the mothers included past pregnancy history, menstrual status, disease history before and during the pregnancy, family history, environmental risk factors and exposure history. The responses of the two groups were compared to calculate the prenatal environmental risk factors of each group. RESULTS: Mothers' smoking was significantly associated with low birth weight infants (adjusted odds ratio (AOR) 3.27; 95% confidence interval (CI) 1.25-8.56) and preterm baby (AOR 4.20; 95% CI, 1.21-14.61). Other environmental risk factors were not significantly different between the two groups. CONCLUSION: Smoking of mothers can be a risk factor for the delivery of low birth weight infants. These results could provide the basic data on prenatal environmental risk factors of mothers of low birth weight infants and suggest research topics for further community-based evaluation.; Summary

Maternal Exposure to Environmental Tobacco Smoke (ETS) and Pregnancy Outcome (low birth weight or preterm baby) in Prospective Cohort Study.: Bo Eun Lee, Yun Chul Hong, Hye Sook Park, Jong Tae Lee, Jeong Youn Kim, Young Joo Kim, Sang Hyun Kim, Kang Jung Goo, Joo Oh Kim, Eun Hee Ha; Korean J Prev Med. 2003;36(2):117-124.

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Abstract PDF: OBJECTIVES
This study was performed to examine the relationship between maternal exposure to environmental tobacco smoke (ETS) and pregnancy outcomes (low birth weight or preterm baby) in a prospective cohort study. METHODS: We made a pregnant women's cohort, and followed the pregnancy outcomes, between May 1st 2001 and August 31st 2002. We surveyed 2, 250 women who visited our hospital during their 35th gestational week, with a self-administered questionnaire. The final total of mother-infant pairs analyzed in this study was 1, 712. We used a multiple logistic regression analysis to analyze the effect of maternal ETS on the incidence of preterm or low birth weight, and a linear regression analysis for the birth weight and gestational age. RESULTS: Higher exposure to ETS (> or =1 hours/day) during pregnancy was more negatively associated with the gestational age and birth weight, than no exposure to ETS (no or less than 1hour). Maternal exposure to ETS was associated with preterm baby (adjusted odds ratio (AOR) 1.7; 95% confidence interval (CI) 0.9, 3.3) and low birth weight (AOR 2.3; 95% CI 0.9, 5.5). In addition, we found that maternal ETS may reduce the birth weight by 70g after adjusting for potential confounding factors. CONCLUSIONS: This study suggests that maternal exposure to ETS during pregnancy may increase the frequency of low birth weights and preterm births.; Summary

Maternal Working Conditions on Adverse Pregnancy Outcomes: A Prospective Cohort Study.: Jung Jin Cho, Ji Yong Kim, Jin Joo Chung, Kyung Sim Ko; Korean J Prev Med. 2002;35(3):197-204.

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Abstract PDF: OBJECTIVES
To evaluate the association between working conditions and adverse pregnancy outcomes in Korea. METHODS: We obtained data on health history, lifestyle, housework and working conditions, such as shift work, hours standing, working time, job demand, lifting at work and at home, between August and September 2000, from self-reported questionnaires. A group of 344, occupationally active, pregnant women from 51 industries were studied. Of the women studied, 328 women were further interviewed by telephone between November 2000 and September 2001. Result : Compared with daytime work, shift work increased the risk for preterm birth (an adjusted risk ratio of 2.74, 95% CI=1.02-2.62) and low birth weight (an adjusted risk ratio of 2.74, 95% CI=1.02-2.62). A significantly increased risk was found for prolonged standing, with an adjusted risk ratio of preterm births of 6.80 (95% CI=2.01-23.0). There were no significant differences in the incidence of spontaneous abortion between the occupational working conditions, with the exception of a previous history of spontaneous abortion. CONCLUSION: These findings suggest that maternal working conditions, such as shift work and prolonged standing, contribute significantly to preterm birth and low birth weight.; Summary

Seasonal Variation of Pre-term Births in Korea.: Duk Hee Lee, Sang Hyeok Ma, Hai Rim Shin; Korean J Prev Med. 2000;33(4):402-408.

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Abstract PDF: OBJECTIVES
To investigate possible seasonal patterns of pre-term birth in Korea. METHODS: A total number of 2,669,357 single live births reported to the National Statistical Office from 1995 to 1998 were analyzed. Composite monthly cohorts of ongoing pregnancies were constructed for each month of the year and the probability of pre-term birth was estimated. RESULTS: Increases in the probability of a pre-term birth occurred during winter for the birth of first child and during summer for the birth of second or later child. This seasonal variation was similar among groups divided by sex, residency, age of mother, and education of mother. CONCLUSIONS: These findings suggests that some environmental factors related to season may partially explain the incidence of premature births.; Summary

Maternal risk factors associated with the low birth weight.: Hyung Cheol Park, Jong Park, Youn Ji Lee, Gang Moon; Korean J Prev Med. 1991;24(3):356-362.

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Abstract PDF: This study was performed to identify there maternal risk factors for the low birth weight. During the period from February to June in 1991, the medical record review and questionnaire interview were conducted upon the 465 pregnant women who were admitted to and delivered a baby in 3 general hospitals and an obstetric hospital in Kwangju area. The health and other related information from women who bore the low birth weight infant was compared with those from women who bore the normal birth weight infant. The results obtained were as follows: 1. Maternal age, low body weight at term, illegitimate birth, and maintaining work activity during pregnancy were positively associated with low birth weight. 2. The positive association was revealed between low birth weight and the previous abortion, short gestational weeks, anemia, low maternal weight gain during pregnancy, the obstetric present illness and hypertension. 3. Some maternal working conditions were associated with low birth weight although statistically not significant. 4. In multivariate logistic regression analysis, gestational weeks and maternal weight gain during pregnancy were related with low birth weight.; Summary

Cohort Infant Mortality Rate of Gunwee and Hapchun Counties and an MCH Center in Taegu.: Jung Han Park, Min Hae Yeh, Byung Yeol Chun, Sung Euk Cho, Hyun Kim, Han Jin Chung, Jae Yeon Cho, Jung Hub Song, Gui Yeon Kim, Jang Rak Kim; Korean J Prev Med. 1990;23(1):87-97.

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Abstract PDF: No abstract available.; Summary

Birth Registration Rate and Accuracy of Reported Birth Date in Rural Area.: Jung Han Park, Chang Yik Lee, Jang Rak Kim, Jung Hup Song, Min Hae Yeh, Seong Eok Cho; Korean J Prev Med. 1988;21(1):70-81.

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Abstract PDF: To measure the birth registration rate and the validity of birth registration data in rural area, all of the 4,014 married women under 49 years of age who had not been sterilized in Gunwee county of Kyungpook province were followed by Myun health workers for 2 years from April 1, 1985 to March 31, 1987 and 766 births were detected. All of the birth registration records of Myun offices were reviewed on September 30, 1987 and 944 births which occurred within the above mentioned period were found. Actual birth date obtained by follow-up study were compared with the birth date on registration card. Among 766 births detected by follow-up study, 576 births(75.2%) which were reported within 6 months after birth were ascertained on the official registration records and 96 births(12.5%) were not found on the records although mother stated that the birth was registered. The registration rate within legal due date was 61.3% among 576 births detected by follow-up study and also ascertained on the official records. The registration rate within legal due date was lower in mothers under 20 years of age and above 35 years and in mothers who had only primary education. It was decreased as the birth order increased. The registration rate was higher in births occurred from October to March than births occurred from April to September. All of the births of 7 neonatal deaths were not reported. The registered birth date was consistent with the actual birth date in 78.0%. Birth date on record was earlier than the actual birth date in 6.8% and later in 15.3%. The consistency rate was lower in mothers above 35 years of age(54.5%), and in infants of 4th birth order and above(56.3%). The rate was increased as the maternal education level increased. The rate of boys was higher than that of girls. A higher percentage(17.4%) of infants born in March was registered with earlier date than the actual birth date and most of these registered birth dates were lunar calendar date. This might be related with the age for entering the primary school. The study findings revealed that the birth registration rate within legal due date and accuracy of report have been increased in recent years, but the infant mortality rate derived from the birth registration seems to be very inaccurate. It is suggested to let the medical personnel who delivered the baby report the birth by mail directly to the current address of parent while infants delivered at home without professional attendant may comply with the present registration system.; Summary

English Abstract

Effects of the Late Marriage of Korean Women on the First-birth Interval.: Woojin Chung, Kyoungae Lee, Sunmi Lee; J Prev Med Public Health. 2006;39(3):213-220.

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Abstract PDF: OBJECTIVES
The purpose of this study was to examine the effect of women's late age of marriage on the interval between marriage and their first birth. METHODS: Data from Year 2000 Korea National Fertility Survey was collected through direct interview questionings, and the data was analyzed based on randomly selected sampling. In particular, the married women (N=5,648) were analyzed for the factors that determined the first-birth interval by performing Cox's proportional hazard model survival analysis. RESULTS: Unlike previous findings, the woman whose age of marriage was 30 or more was more likely to delay the birth of her first baby than were the other women who married earlier. Further, a woman's age at marriage, a woman's residence before marriage, her husband's religion, her husband's level of education and the difference in age between the woman and her husband significantly influenced the first-birth interval. In contrast, for a married woman, her age, level of education, current residence and religion were not significant predictors of her first birth interval. CONCLUSIONS: Our study showed that women who married at the age of 30 years or more tend to postpone their first birth in Korea. When facing the increasing number of women who marry at a late age, the Korean government should implement population and social policies to encourage married women have their first child as early as possible.; Summary

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