Night shift work and inflammatory markers in male workers aged 20-39 in a display manufacturing company

This study aimed to determine the association between shift work and inflammatory markers, which are independent risk factors of cardiovascular diseases, in male manual workers at a display manufacturing company. The study was conducted between 1 June and 31 July 2015 on 244 male manual workers aged 20-39 years old at a display manufacturing company and investigated age, marital status, education level, alcohol consumption habit, smoking habit, regular exercise habit, sleep duration, sleep debt, sleep insufficiency, past medical history, current and past shift work experience, duration of shift work, and weekly work hours through face-to-face interviews using structured questionnaires and performed blood tests. Study participants were divided into daytime, former shift, and current shift workers based on the work schedule. Chi-square tests and one-way analyses of variance were performed to compare inflammatory markers and cardiovascular disease risk factors, and analyses of covariance were conducted after adjusting for variables potentially affecting inflammatory markers. High-sensitivity C-reactive protein (hs-CRP; mean?±?standard deviation) levels in daytime, former shift, and current shift workers were 0.65?±?0.43, 0.75?±?0.43, and 0.86?±?0.72 mg/L, respectively (p?=?0.029). The leukocyte count (mean?±?standard deviation) was 5,556?±?1,123, 6,210?±?1,366, and 6,530?±?1,216 cells/?L, respectively (p?