Table 3.

Mean concentration of serum cytokines according to CWP

Values are presented as geometric mean (standard deviation). ILO classification 0/0 or 0/1.

CWP: coal workers' pneumoconiosis, IL-8: interleukin-8, TNF-α: tumor necrosis factor-alpha, BMI: body mass index, RCM: reliability centered maintenance, FVC: forced vital capaity, FEV₁: forced expiratory volume in on second.

^*Calculated by student's t-test (healthy RCM vs. RCM with CWP).

^†Calculated from a multiple logistic regression model with serum level of each cytokines, adjusted for age, BMI, exposure period, smoking status, and pulmonary function (%FVC predicted, %FEV₁ predicted, and %FEV₁/FVC ratio).