Annals of Occupational and Environmental Medicine

Byeong Chul Choi

2 Articles

Time Series Analysis between the Concentration of Air Pollutants and the Number of Respiratory Disease Outpatients in Seoul: Byeong Chul Choi, Jung Wan Koo, Sung Kyun Park, Hyun Woo Yim, Kang Sook Lee, Won Chul Lee, Chung Yill Park; Korean Journal of Occupational and Environmental Medicine 2000;12(1):70-80. Published online March 31, 2000; DOI: https://doi.org/10.35371/kjoem.2000.12.1.70

OBJECTIVES
This study was conducted to investigate whether air pollution levels in Seoul have short term effects on respiratory disease outpatients.
METHODS
We analyzed five air pollutants (CO, NOy, Oy, SOp, PMyp) and daily counts of outpatient for respiratory disease divided by age group ((15yrs, 15-64yrs, 65+yrs) during the period of July 1997-June 1998 using Generalized Additive Model(GAM).
RESULTS
After controlling for seasonal trends, day of the week, week of the month, temperature and humidity, CO (RR=1. 041 ~ l. 051, 0-day lag) and NOy (RR=1. 024~1. 050, 3-day lag) were significantly associated with daily counts for respiratory disease in all age groups. 0, and SO, were associated, with a 3-day lag in the age group under 15 years (O RR=1. 047, 95% CI=1. 045- 1. 049 i SOp RR=1. 018, 95% CI=1. 017- l. 020) and with a 0-day lag in the age group 15 to 64 years (0, RR=1. 035, 95% CI=1. 032-1. 037; SO, RR=1. 037, 95% CI=1. 035-1. 039), in the age group over 65 years (O RR=1. 042, 95% CI=1. 033-1. 051; SO RR=1.029, 95% CI=1.022-1.036). PM was weakly associated, with a 1-day lag in the age group under 15 years (RR=1.011, 95% CI=1.010-1.013) and with a 0-day lag in the age group 15 to 64 years (RR=1. 021, 95% CI=1. 019-1. 023), in the age group over 65 years (RR=1. 025, 95% CI=1. 018-1. 032). In the two pollutant model, the magnitudes of the relative risk for CO, NOy and Oq were maintained, but SOy was not associated with daily counts for respiratory disease in the age group under 15 years after controlling for NO,. PMyp was not associated in all age groups after controlling for CO, so the association with PMyp in the single pollutant model might be confounded by CO. In this study, the impact Of PMyp on the respiratory disease was not large as compared with other pollutants.
CONCLUSIONS
Air pollution in Seoul may increase the incidence of the respiratory disease, so more positive attention for the control of air pollution should be paid.

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Impact of environmental factors on pulmonary tuberculosis in multi-levels industrial upgrading area of China
Xiang Yi, Shixiao Liu
Environmental Research.2021; 195: 110768. CrossRef

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Prevalence of Tinnitus and Hearing Thresholds of a Non-Noise-Exposed Population with and without Tinnitus: Jung Wan Koo, Won Chul Lee, Hyunwook Kim, Byeong Chul Choi, Min Hwa Oh, Chung Yill Park; Korean Journal of Occupational and Environmental Medicine 1999;11(3):323-331. Published online September 30, 1999; DOI: https://doi.org/10.35371/kjoem.1999.11.3.323

Abstract PDF

OBJECTIVES
In order to establish prevalence and characteristics of tinnitus and hearing thresholds according to tinnitus, this study was carried out.
METHODS
Nine hundred and thirty two subjects, undergone human dock or general health check-up and been in college, were surveyed to the questionnaire on the general characteristics, past medical histories, life styles, subjective symptoms about hearing, taking ototoxic drugs and were conducted on the hearing thresholds by pure tone audiometry.
RESULTS
Of the total population, 98 reported tinnitus, giving an overall prevalence of 10.5%, prevalence of tinnitus in the subjects with the factors infuencing hearing thresholds were 17.4 %, prevalence without the factors influencing hearing thresholds were 7.5 %. Frequency of tinnitus of the total population was the highest in 'once per several months'(39.6 %) and followed by' once per several days'(29.7 %), 'all day long'(16.5 %) and' several times per day'(14.3 %). Complaint site of tinnitus was 41.8 % in left ear or right ear 39.6 % in both ear and 18.7 % in head. The 13.6% of the total subjects complained sleep disturbance. Hearing thresholds in the subjects without the factors influencing hearing thresholds tended to increase or decrease in 20 and 30 years old according to tinnitus, but those with, tinnitus tended to increase more than chose without tinnitus in 40 and 50 years old.
CONCLUSIONS
Results also provide evidence that reports of tinnitus at the time of annual audiometric testing may be useful in identifying workers at greater risk for developing significant shifts in hearing thresholds. Awareness of the possible occurrence of tinnitus may encourage worker to cooperate more actively in a company hearing conservation programme.

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Autonomic Conditions in Tinnitus and Implications for Korean Medicine
Eun Ji Choi, Younghee Yun, Seungyeon Yoo, Kyu Seok Kim, Jeong-Su Park, Inhwa Choi
Evidence-Based Complementary and Alternative Medicine.2013; 2013: 1. CrossRef
Roles of Cognitive Characteristics in Tinnitus Patients
So-Young Lee, Ji-Hae Kim, Sung-Hwa Hong, Dong-Soo Lee
Journal of Korean Medical Science.2004; 19(6): 864. CrossRef

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