Occupational Differences in C-Reactive Protein Among Working-age Adults in South Korea.

OBJECTIVE To examine the association between occupational class and high-sensitivity C-reactive protein (hsCRP) in Korean workers. METHODS We used a nationally representative sample of Koreans (n = 2,591) aged 19-65 years from the 2015 Korea National Health and Nutrition Examination Survey. The concentration of hsCRP (mg/L) was assessed by a high sensitivity immunoturbidimetric assay. Current occupation was categorized as: white-collar (managers/professionals), pink-collar (clerks/service/sales), blue-collar (craft/equipment/machine-assembling, agricultural/forestry/fishery, and elementary-level labor), or unemployed. Cross-sectional linear regression models adjusted for sociodemographic/work-related/health conditions and behaviors. RESULTS Compared with blue-collar workers, white-collar workers showed significantly higher levels of hsCRP ( = 0.16, 95% CI: 0.02, 0.30) after adjusting for all covariates, whereby the pattern was more pronounced among professionals. However, the association was not significant for unemployed and pink-collar workers. CONCLUSIONS Findings suggest that Korean white-collar workers, particularly professionals, have elevated levels of inflammation.