Table 6.

Correlation coefficient between concentration of serum cytokines and independent variables (n = 110)

Cytokines were log transferred data.

BMI: body mass index, FVC: forced vital capacity, FEV₁: forced expiratory volume in one second, IL-8: interleukin-8, TNF-α: tumor necrosis factor-alpha.

^*Pearson's product moment correlation coefficient (r), ^§p < 0.01, ^∥p < 0.05.

^†Spearman's rank correlation coefficient (rho), ^§p < 0.01, ^∥p < 0.05.

^‡Severity (ILO stage)of pneumoconiosis with small opacity (n = 86).