Ann Occup Environ Med.  2018 ;30(1):32. 10.1186/s40557-018-0242-z.

Cardiovascular disease risk differences between bus company employees and general workers according to the Korean National Health Insurance Data

Affiliations
  • 1Department of Preventive Medicine, Seoul National University College of Medicine, Seoul, Republic of Korea. ychong1@snu.ac.kr.
  • 2Institute of Environmental Medicine, Seoul National University Medical Research Center, Seoul, Republic of Korea.

Abstract

BACKGROUND
Bus drivers are known to be highly at risk of cardiovascular diseases. In this study, we assessed the cardiovascular disease prevalence of bus company employees in Seoul, South Korea, and compared the results to those of general workers.
METHODS
We analyzed the 2014 Korean National Health Insurance (NHI) data and defined hypertension, diabetes, dyslipidemia, ischemic heart disease, and cerebrovascular disease based on the KCD-6 medical diagnoses. We used bus company employees as surrogate participants of bus drivers due to the characteristics of Korean NHI data. We identified bus company employees in Seoul based on one's workplace which the insurance is registered. The prevalence of five diseases was compared between the bus company employees and general workers. We also calculated the odds ratios (OR) of five diseases between the bus company employees and general workers. To compensate the vast demographical differences between the two groups, we performed propensity score matching.
RESULTS
Bus company employees have higher OR for having hypertension (OR 1.33, 95% CI: 1.28-1.39), diabetes mellitus (1.14, 95% CI: 1.08-1.22), and dyslipidemia (1.23, 95% CI: 1.17-1.29) than the general workers or propensity score matched controls. However, the OR of having ischemic heart disease were not significant. The OR of cerebrovascular disease were lower in bus company employees than in the general workers after adjusting the covariates, but similar in the propensity score matched model.
CONCLUSION
This study showed that the ORs of cardiovascular disease risk factors are high in bus company employees when compared to the general working population. Further studies with the longitudinal design should be conducted to confirm the causal association.

Keyword

Bus company employees; Cardiovascular disease; Commercial driver; National health insurance
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