With rapid industrialization and urbanization, environmental pollution has become an urgent health problem. Asthma attack is a common and severe disease, and can be a sentinel event of worsening air pollution. There are, however, few studies about the epidemiolgy of asthma and the association between asthma and low level air pollution in Korea. This study was conducted to describe the trend and pattern of asthma attack and to examine the effect of air pollutants on admission in Korea. Combined data of this study are medical insurance claims for asthma, data from telemetry system of the Ministry of Environment for air pollutants, and air temperatures from monthly weather reports of the Meteorological Administration. To describe the temporal trends of asthma in Korea, insurance claims since 1985 were analized. Age specific asthma visit/admissions per 1000 eligible persons, as well as ratio of asthma visit/admissions over all visit/admissions showed a steady increase in asthma attack in Korea. Asthma prevalence was relatively high among under 5 years and over 50 years of age, and in these age groups asthma was more prevalent among males. The effects of relatively low level air pollution and weather condition on the number of patients who had asthma attacks admitted to hospitals in Seoul area were studied from April 2 to April 24, 1993. Asthma admissions were examined throughout the study period (392 cases), except sunday and holiday(354 cases) and except sunday, holiday and saturday (293 cases), while grouped into three age categories (3 12, over 40, and all age). Following results were obtained through correlation and multiple regression analysis. The number of adimission were significantly correlated with ambient air concentrations of total suspended particles (TSP), sulfur dioxide (SO2) and carbon monoxide(CO). 1) The number of admissions on the same day were significantly correlated with ambient air maximal concentrations of total suspended particcles among persons who were above 40 year old. 2) The effects of maximal daily concentrations of sulfer dioxide(SO2) among persons who were of 3- 12 age were significant when one day lagged asthma admission was compared with the air pollution on the previous day. 3) The number of admissions on 1-day lag were significantly correlated with ambient air maximal daily concentrations of carbon monoxide(CO) among persons who were above 40 year old. The associations between temperatures and number of admissions were not significant in this study. Levels of pollutants were fairly low, the monthly mean being 0.022 ppm for SO2, 0.032 ppm for NO2, 3.2 ppm for CO, 0.015 ppm for 03, and 240 micro gram/m3 for TSP. The mean temperature was 10.6degrees C. These results suggest that concentration of air pollutants lower than those given as guidelines may increase the incidence of asthma attacks.
Adult ; Air Pollutants ; Air Pollution* ; Asthma* ; Carbon ; Environmental Pollution ; Holidays ; Humans ; Incidence ; Insurance ; Korea* ; Male ; Prevalence ; Seoul ; Sulfur Dioxide ; Telemetry ; Urbanization ; Weather

No abstract available.
Follow-Up Studies* ; Occupational Diseases*

In Korea, sudden deaths of middle-aged and older male workers who are the responsible persons at home as well as workplace, have aroused social concern. Besides, U.N. has reported recently that mortality of Korea male in 40-50's was one of the highest among newly developed countries in 1992. Not much is, however, known about the nature of the work contributing to the mortality of different groups of workers. Therefore, this study was done to examine mortality of public servants, comprising about 5% of all the employed in Korea, according to their job titles and grades. The datas of 1753 official deaths, comprised 323 (only disease-oriented deaths) applicants of survivors' compensation, were used to examine age-adjusted Standardized Mortality Ratios(SMRs) according to their job titles, grades, tenures and cause of deaths. Controlling age and sex difference was conducted using 26,950,481 general population, 95,340 general deaths and 864,560 working public servants. All the groups were aged 20-64, who were being observed January - December in 1993, at the same time. Results and discussions are as follows. 1. SMRs standardized by general population was significantly low (SMR 44.9 CI 42.8-52.7) for all job titlses. Of public servants, 90.0% was graduated from high school, although 17.5% in general population. The distinction of social status such a education may produce a strong healthy worker effect. Besides, SMRs for different tenure groups showed a steady increase as tenure increases. This suggests that the magnitude of healthy-worker effect may be greater with increasing tenures. 2. SMRs standardized by own public servants was significantly elevated for workmen(SMR 121.0, CI 110.2-132.6) in solitue. When SMRs for different grade of workmen was examined, 9th(SMR 124.2, CI 104.4-146.7) and 10th(SMR 137.9 CI 120.8-156.8)grade, lower grade in workmen, showed significantly elevated SMRs. Of workmen, 57.0% were graduated from high school and 50.1% in 9th grade, as well. These mean that low economic states made up social class, education may increase mortality rate. 3. Of SMRs according to all causes of death, only policemen on 'cause of death related hypertensive disease'(SMR 282.5, CI 121.6-556.7) was significantly high except for 'cause of death related other signs, symptoms and ill-defined conditions'. 4. When SMRs on cause of death related hypertensive disease for different grade of policemen was examined, senior policemen(SMR 241.9), in charge of the front service, showed elevated SMR, in spite of statistical no significance. Especially, the working hour of senior policemen is quite long and also the work schedule is even more irregular for policemen. The results of this study showed that mortality for different jobs differed, and it differed also for different grades in the same job. This difference in mortality may reflect the difference in the nature of job contents, and further studies are warranted to elucidate which job characteristics are responsible.
Appointments and Schedules ; Cause of Death ; Compensation and Redress ; Death, Sudden ; Developed Countries ; Education ; Healthy Worker Effect ; Humans ; Korea ; Male ; Mortality ; Police ; Sex Characteristics ; Social Class

A cross-sectional study was conducted to assess the association between perceived occu-pational psychosocial stress at work and the work-related musculoskeletal disorders (WRMSD) among employees using video display terminals. The study included 111 female telecommunication employees from three companies at ChungBuk province. Cases of WRMSD were defined using symptom questionnaire and physical examination conducted by rehabilitation specialist. Information on demographics, individual factors, and perceived psychosocial stress, were obtained by self-administered questionnaire. For assessing perceived psychosocial stress, we used variables from 'job strain model' proposed by Karasek. Associations between perceived psychosocial stress and WRMSD were assessed by multiple logistic regression models. Forty nine (44% to the total) subjects met our operational definition for WRMSD. Age, seniority, housing load were not associated with WRMSD. Perceived psychosocial stress was associated with WRMSD [odds ratio=3.28, 95% confidence interval: 1.05-10.19]. This study suggests that perceived occupational psychosocial stress is related to the prevalence of WRMSD.
Chungcheongbuk-do ; Computer Terminals* ; Cross-Sectional Studies ; Demography ; Female ; Housing ; Humans ; Logistic Models ; Physical Examination ; Prevalence ; Questionnaires ; Rehabilitation ; Specialization ; Telecommunications

OBJECTIVES: Mass poisoning by carbon disulfide (CS2) occurred in a viscose rayon factory in Korea. Up until 1998, 830 employees, including 38 who had died, were diagnosed with CS2 poisoning. Among the CS2 poisoned subjects, heart rate variability (HRV) was evaluated to investigate whether the toxic effect of CS2 persists after the exposure has ceased. The dose-response relationship between carbon disulfide exposure and HRV was also evaluated. METHODS: The case group was comprised of 71 retired male workers diagnosed as being CS2 poisoned. The control group was comprised of 127 males of same age-range who had no history of CS2 exposure and cardiovascular diseases. Information on individual age, height, weight, cigarette smoking, alcohol drinking, regular exercise, medical and occupational history, chest x-ray, and ECG recording of the two groups were collected through a self-administered questionnaire and with a medical examination. Time (maximum, average, minimum RR interval) and frequency domain measures (low frequency - LF, high frequency - HF, total power spectrum TPS, and LF/HF ratio) of the two groups were analyzed. CS2 exposure indices of the case group (duration of employment, exposure level per work department, cumulative exposure index and duration of retirement) were investigated. RESULTS: Using a univariate analysis, the frequency domain measures for the case group were significantly lower than those in the control group, except for HF. In the multivariate analysis, previous history of CS2 poisoning was inversely related to all frequency domain parameters and it significantly affected the LF (p<0.05) and the LF/HF ratio (p<0.05). There was no significant dose-response relationship between CS2 exposure indices and HRV parameters in the case group. CONCLUSION: This study suggests that further studies are necessary to evaluate the residual effects of CS2 poisoning even after the CS2 exposure has ceased.
Alcohol Drinking ; Carbon Disulfide* ; Carbon* ; Cardiovascular Diseases ; Electrocardiography ; Employment ; Heart Rate* ; Heart* ; Humans ; Korea ; Male ; Multivariate Analysis ; Poisoning* ; Questionnaires ; Smoking ; Thorax

The objectives of this study are to investigate the prevalence of occupation related carpal tunnel syndrome(CTS) among workers in a condom industry; to analyse the sensitivity and specificity of clinical signs or symptoms such as hand diagram, Tinel's sign and Phalen's sign in carpal tunnel syndrome; and to test vibration threshold test using audiometry as a technically easy and noninvasive method in the diagnosis of carpal tunnel syndrome in stead of nerve conduction velocity(NCV). The study group was divided into exposed group(39 cases)and non-exposed group(48 cases) based on whether or not excessive use of wrist movements exist. 1. There are statistically significant differences in symptoms and signs of carpal tunnel syndrome such as hand diagram, Tinel's sign and Phalen's sign between exposed and non-exposed group(p<0.05). 2. Six cases(9 hands) were confirmed as carpal tunnel syndrome by NCV. Five cases(7 hands) belonged to exposed group, 1 case(2 hands) to nonexposed group. As there are significant differences in prevalence of carpal tunnel syndrome between two groups(p<0.05), excessive use of wrist in occupation is a risk factor of carpal tunnel syndrome. 3. When we use NCV as a gold standard in the diagnosis of carpal tunnel syndrome, sensitivity and specificity of hand diagram, Tinel's sign and Phalen's sign is as followed; hand diagram; sensitivity 88.9%, specificity 84.2%. Tinel's sign; sensitivity 55.6%, specificity 72.8%. Phalen's sign; sensitivity 14.3%, specificity 88.4%. Among above clinical signs and symptoms, hand diagram is the best clinical screening test. 4. The differences of vibration threshold between median and ulnar nerve at the same time are useful in the diagnosis of carpal tunnel syndrome but the time change of vibration threshold of median nerve over time are not sensitive enough. It is concluded that vibration threshold between median and ulnar nerve at the same time can be used as a supplementary or alternative criterion to indicate that the nerve dysfunction is located in the carpal tunnel.
Audiometry ; Carpal Tunnel Syndrome* ; Condoms* ; Diagnosis ; Hand ; Mass Screening ; Median Nerve ; Neural Conduction ; Occupations ; Prevalence ; Risk Factors ; Sensitivity and Specificity ; Ulnar Nerve ; Vibration ; Wrist

To investigate the effect of carbon disulfide on blood pressure, the BP measurements in the periodic health examination results and the medical records of factory clinic were reviewed The study subjects were composed of 1336 male and 544 female workers, who were categorized into three groups by the exposure status-highly exposed, moderately exposed and non-exposed group. The results of the study were as follows; 1. The age-adjusted mean systolic and diastolic BP of male workers were 122.35 mmHg/79.11mmHg in highly exposed, 121.57mmHg/79.05mmHg in moderately exposed and 122.67mmHg/82.27mmHg in non-exposed group. For female workers, BP were 115.13mmHg/74.49mmHg in moderately exposed and 113.48mmHg/74.30mmHg in non-exposed group. 2. In multiple regression analysis of maximum BP against Age and tenure, the slope coefficients of age and tenure on the systolic BP were 0.379, 0.667 respectively and those on the diastolic BP were 0.331, 0.405 respectively in highly exposed male workers. Tenure was a significant variable in this study. For female workers, however, the slope coefficients of tenure on BP were significant only for systolic BP of moderately- expected group. 3. In multiple regression analysis of Bp against age, cumulative exposure index(CEI), cholesterol, all the variables showed significant slope coefficients in male, but age and CEl on systolic BP were significant for female workers (P<0.05). 4. In the multiple analysis of the amount of Bp change and the velocity of Bp change among male workers, the slope coefficients of tenure tended to increase as exposure level increased. Among female workers, the slope coefficients of tenure were significant on the amount of Bp change and the velocity of Bp change in moderately exposed group.
Blood Pressure* ; Carbon Disulfide* ; Carbon* ; Cholesterol ; Female ; Humans ; Male ; Medical Records

We calculated the age specific Proportionate Morbidity Ratio(PMR)' for different areas as the outcome index by using the national cancer registry data(1988 1991) to assess the patterns of stomach cancer and bladder cancer. Also, we calculated 'Manufacturing workers Concentration Index(MCI)' for different areas as the exposure index by using the census data reported in 1980 to assess the relationship between cancer site specific PMRs and MCIs. As a result, we found the significant correlation(r=0.61, p=0.002) between the bladder cancer in the age of 40s and the industrial exposure indicator. Future analytic studies should be fruitful in identifying more occupational risk factors for bladder cancer. Investigation of cancer incidence including geographic variations and difference by age may identify patterns suggesting occupational exposures.
Adult* ; Censuses ; Fruit ; Humans ; Incidence ; Korea* ; Male* ; Occupational Exposure* ; Risk Factors ; Stomach Neoplasms ; Urinary Bladder Neoplasms* ; Urinary Bladder*

In Korea, female workforce has reached more than 40% of total working population but the effects of work on spontaneous abortion are yet to be examined. This study was conducted to investigate the occupational effects on spontaneous abortion. Medical insurance claim data were used to examine the effects of the employment status and industry of employment on spontaneous abortion The study population was composed of females, aged 15~44, who were the beneficiary of medical insurance in the month of June, 1993. The working females covered by medical insurance for industrial workers, hand the highest age-adjusted Spontaneous Abortion rate(SAB rate=claim frequency of spontaneous abortion/claim frequency of complication of pregnancy, childbirth and the puerperium), 6.65% whereas female dependants of medical insurance for industrial workers had the lowest age-adjusted SAB rate, 4.54%. Among industrial workers, the workers in manufacturing industry had the highest age-adjusted Spontaneous Abortion ratio(SAB ratio=claim frequency of spontaneous abortion/claim frequency of completely normal delivery), 43.2/100 whereas those in financing and service industry had age-adjusted SAB ratio, 16.2/100 and 20.5/100, respectively. The results of the study suggest the adverse effect of manufacturing industry on reproduction. Work environment such as chemical exposures, overwork, awkward posture, and job stress should be further studied for their effects on reproductive functions of female.
Abortion, Spontaneous* ; Employment* ; Female ; Female* ; Hand ; Humans ; Insurance ; Korea ; Parturition ; Posture ; Pregnancy ; Reproduction

OBJECTIVES: The aim of this study was to evaluate the relationship between shift work and work-related injuries in a representative sample of Korean workers. METHODS: We used data from the Korean Working Condition Survey of 2006. The participants were 7,075 Korean workers 15 to 64 years of age. Logistic regression was employed to estimate the relationship between shift work and work-related injury using the SAS version 9.2 program. RESULTS: Shift work was significantly related to work-related injuries compared to non-shift workers(OR 2.40, 95% CI=1.65~3.48). When personal and occupational risk factors were accounted for, shift work had a statistically meaningful relationship with work-related injuries compared to non-shift work(OR 1.79, 95% CI=1.20~2.66). CONCLUSIONS: In this study, shift workers appear to have a higher risk of work-related injuries compared to non-shift workers. Work-related injuries in shift workers could be attributed to circadian rhythm disorder and sleep problems. Suitable arrangements that ensure flexible working times are needed for shift workers. Further study will be needed to identify and mitigate work-related injuries among shift workers.
Chronobiology Disorders ; Dietary Sucrose ; Humans ; Logistic Models ; Phenothiazines ; Risk Factors