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Myung Wha Ha 2 Articles
Long term noise exposure of steel mill workers, hearing loss and blood pressure.
Myung Wha Ha, Doohie Kim
Korean J Prev Med. 1991;24(4):496-506.
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A cross-sectional study was conducted to investigate the effect of long term noise exposure on blood pressure among steel mill workers. The workers participated in periodic medical examinations performed from August 27 to September 6 in 1990. Examined were 1,034 workers with high-level noise exposure(average 91.8+/-5.2 dB{AA)), and 390 workers with low-level noise exposure(average 75.2+/-4.6 dB(A)). No significant difference was found in systolic or diastolic blood pressure between the two exposure groups. Prevalence of hypertension (> or = 160 mmHg systolic or > or = 100 mmHg diastolic) was higher in a younger age group (< or = 40 years old) of high-level noise exposure than of low-level noise exposure. However, the difference was not statistically significant. Furthermore, in younger ages, prevalence of. hypertension appeared to be higher in the hearing loss group (> or = 25dB at 1000 Hz or > or = 40 dB at 4000 Hz in at least one ear) than in the normal hearing group. From multiple regression analysis, hearing loss, body mass index, age, alcohol and family history of hypertension were proven to be predictors of diastolic blood pressure (p<0.02). When regression was performed for each age group, hearing loss was a strong predictor of diastolic pressure in the younger age group (p<0.01).
Summary
Formaldehyde exposure in the plywood manufacturing factory.
Myung Wha Ha, Doohie Kim, Hyun Sul Lim, Sang Hu Park
Korean J Prev Med. 1991;24(1):37-44.
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In the plywood manufacturing factory established in 1979, female 3 workers who had exposed to adhesives containing formaldehyde for more than 48 months of duration suffered from eye, nasal, oral, throat and skin irritation and dyspnea as chief complaints. The actual level of the exposure to formaldehyde were not estimated when the exposed workers started to have above symptoms. The environmental monitoring of workplace was measured on April 25, 1990, and the concentration of formaldehyde revealed 0.2 ppm, however the exhaustive ventilatory system was already installed at that time. Twenty six subjects from entire factory were examined by questionnaire, physical examination and spirometry, etc. on August 22, 1990. Significant difference was observed in symptoms and signs of nasal, oral and throat irritation between teh exposed group with longer duration and that with short duration. When the exposed group with longer duration was compared to the group of nonexposed, symptoms and signs of nasal, oral, throat and skin irritation, chest tightness and dullness were significantly increased in the former group. The results of the spirometric test showed that the forced vital capacity and the forced expiratory volume at 1 second were decreased amont the exposed group with longer duration but not significant.
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JPMPH : Journal of Preventive Medicine and Public Health