Objectives Previous studies have shown that participation in social activities (SA) can prevent cognitive decline (CD) and that living arrangements (LA) can affect cognitive function. This study aimed to evaluate the effects of SA and LA on CD, as well as their interactions, using longitudinal data.
Methods Data were used from the 2006-2018 Korean Longitudinal Study for Aging, which followed 10 254 adults older than 45 years over a 12-year period. CD was defined as a ≥4-point score decrease in the Mini-Mental Status Exam over 2 years. We developed an extended Cox proportional hazards model for time-dependent covariates to estimate the hazard ratio (HR) of CD in 4 groups: (1) socially active and living with others, (2) socially active and living alone, (3) socially inactive and living with others (SILO), and (4) socially inactive and living alone (SILA). The model was stratified by gender and adjusted for important confounders.
Results The HR of CD was significantly higher in the SILO group in men (HR,1.36; 95% confidence interval [CI], 1.08 to 1.78) and in the SILA group in women (HR, 1.72; 95% CI, 1.08 to 2.75). However, the interaction term for gender was not significant.
Conclusions Among socially inactive elderly adults, the HR of CD was elevated in men who lived with others and in women who lived alone, although the interaction term for gender was not significant. Socially inactive men who live with others and socially inactive women who live alone are particularly encouraged to participate in SA to prevent CD.
Summary
Korean summary
고령화연구패널조사(KLoSA)(2006-2018)에 참여한 10,254명의 45세 이상 성인을 2년마다 추척하여 생존분석을 이용하여, 사회활동 참여여부와 독거 여부가 인지기능 저하에 미치는 영향을 분석하였다. 인지기능 저하는 2년동안 Mini-Mental Status Exam이 4점 이상 감소한 경우로 정의하였다. 그 결과 사회활동에 참여하지 않으면서 가족과 함께 사는 남성과, 사회활동에 참여하지 않으면서 혼자 사는 여성에서 인지기능 저하의 위험이 증가했다.
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Objectives Bisphenol A (BPA) is used in the electrical, mechanical, medical, and food industries. Previous studies have suggested that BPA is an endocrine disruptor. Regulation of BPA has led to increased use of bisphenol F (BPF) and bisphenol S (BPS). However, few studies have investigated the associations of BPF and BPS with thyroid dysfunction in children. Our study investigated the associations of prenatal BPA and early childhood BPA, BPF, and BPS exposure with thyroid function in 6-year-old children.
Methods Prenatal BPA concentrations were measured during the second trimester of pregnancy in an established prospective birth cohort. We measured urinary BPA, BPF, and BPS concentrations and thyroid hormone levels (thyroid-stimulating hormone, total T3, and free T4) in 6-year-old children (n=574). We examined the associations between urinary bisphenol concentrations and percentage change of thyroid hormone concentrations using multivariate linear regression. We also compared thyroid hormone levels by dividing the cohort according to BPA, BPF, and BPS concentrations.
Results The associations between prenatal BPA and total T3 levels were statistically significant in all models, except for girls when using a crude model. The associations between urinary BPA and BPS concentrations and levels of all thyroid hormones were not statistically significant. However, we observed that lower free T4 levels (-1.94%; 95% confidence interval, -3.82 to -0.03) were associated with higher urinary BPF concentrations in girls only.
Conclusions Our findings identified significant associations between prenatal BPA exposure and total T3 levels in all children and between BPF exposure and free T4 levels in girls only.
Summary
Korean summary
비스페놀 A의 건강위해성에 대한 역학적 근거들이 축적되어 비스페놀 A 대신 BPF와 BPS와 같은 대체물질이 사용되고 있다. 본 논문에서는 어머니의 산전 비스페놀 A 노출과 6세 어린이의 비스페놀 A, 비스페놀 F, 비스페놀 S 노출 정도에 따라 어린이의 갑상선호르몬 농도에 어떠한 영향을 미치는가 보고자 하였다. 어머니의 산전 비스페놀 A 노출은 어린이의 total T3 농도에 유의하게 영향을 미쳤으며, 특히 여자아이에게서 비스페놀 F 노출이 한 단위 증가할수록 free T4 농도가 유의하게 감소하는 것을 관찰하였다. 본 논문의 의의는 비스페놀 F, S가 어린이의 갑상선기능에 어떠한 영향을 미치는지 역학적 근거를 제시하였다는 점이나, 인과적 연관성을 위해서는 시간적 선후관계를 고려한 더 많은 연구가 필요하다.
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