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Survival analysis of coal worker's pneumoconiosis by radiological findings
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Kyung Yong Rhee, Gwan Hyeong Yi, Ho Keun Chung
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Korean J Epidemiol. 1990;12(1):44-56.
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 Abstract
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Abstract
The authors investigated mortality rates and survival curves of coal workers’ pneumoconi-oses(CWP) in hospitalization by radiological findings with covariates, i.e.. age, emphysema, and pulmonary tuberculosis. Study subjects were composed of 738 patients entered the cohort in diffent years.
There were differences in survival curves of CWP according to radiological findings controlled by the covariates. Mortality rate of large opacity group at five years was higher than that of small opacity group. The mortality rate of the group of irregular shape was also higher than that of rounded shape.
There were differences in the pattern of survival curves of each group of profusion 1, 2, and 3 controlled by the covariates. In large opacity groups, A, B, and C, there were also differences in the pattern of survival curves.
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Summary
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Prevalence of coal workers' pneumoconiosis in Kangreung and Taeback areas
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Kyung Yong Rhee, Ho Keun Chung
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Korean J Epidemiol. 1988;10(2):195-203.
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Abstract
Authors surveyed prevalence rate of coal workers’ pneumoconiosis in coal miners in Kangreung and Taeback areas. Because of difference of working conditions including concentration and composition of coal dust in workplace between two areas, difference of prevalence rate between two areas will be expected. Sample size was 2,913 coal miners; 161 coal miners(6.2% of total coal miners in Kangreung area) in Kangreung area, and 2,752 coal miners(11.1% of total coal miners in Taeback area), selected randomly according to coal mining company by size of workers. Data was collected by record of regular health screening test in 1986, and chest x-ray films of all study subjects were read by one radiologist to eliminated inter-observer variation.
There is no difference of prevalence of coal workers’ pneumoconiosis between two areas, respectively 18.5% in Taeback, 18.6% in Kangreung(including suspicious case) in spite of difference of working conditions, characteristics of coal miners. And there was correlation between employing year, migration history and prevalence rate of coal workers’ pneumoconiosis: prevalence rate in longer employing coal miners was higher than that in shorter employing coal miners(under 1 year: 4.6%, 1-5 year: 7.2%, 5-10 years: 19.7%, 10 year and over: 43.9%), and that of migratory coal miners higher than that of non-migratory coal miners(non-migratory: 17.2%, migratory: 25%).
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Morbidity rate and health care utilization in coal miners
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Kyung Yong Rhee, Ho Keun Chung
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Korean J Epidemiol. 1988;10(1):75-85.
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Abstract
In order to investigate healthy worker effect in morbidity rate and health care utilization of coal miners, the author surveyed morbidity rate of coal miners, iron miners and cement manufacturing workers as comparison groups from April to May in 1986. Structured questionnaire interview was used by medical student as well trained interviewer for survey.
Subject of this study was sampled randomly, and sample size was 1,825 workers totally; 632 coal miners, 265 iron miners, 928 manufacturing workers.
The major findings were as follows:
1) After adjusting general characteristics, morbidity rate of coal miners was higher than that of other two groups(coal miners: 59%, iron miners: 49%, manufacturing workers: 25%).
2) After adjusting general characteristics, unmet need rate of coal miners was higher than that of other two groups(coal miners: 65%, iron miners: 50%, manufacturing workers: 46%).
3) Distribution of respondent by reason for non-visit to health care facilities in each groups were different. Major two reasons in each group were follows: not severe(51.3%) and poor(13.9%) in coal miners, not severe(84.6%) and busy(4.6%) in iron miners, not severe(82.9%) and busy(2.7%) in manufacturing workers.
4) There was no healthy worker effect in morbidity rate of coal miners and iron miners, but in manufacturing workers healthy worker effect was controversial because of morbidity rate of general population.
5) Number of visit to hospital and clinic within two weeks per worker was 0.296 in coal miners and in iron miners that was 0.328, and in manufacturing workers that was 0.164.
6) Patterns of health care utilization in each group were very similar. Drug store was most accessible health care facility because of its geographical accessibility and health care cost. And hospital and clinic were also available health care facilities because of health insurance.
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