Correlation between MDA and IgG, IgA level in lymphocytes of workers in control group ((a), r = −0.498, P < 0.001; (c), r = −0.363, P = 0.001) and exposed group ((b), r = −0.606, P < 0.001; (d), r = −0.814, P < 0.001), respectively; correlation between 8-OH-dG and IgG, IgA level in lymphocytes of workers in control group ((e), r = −0.229, P = 0.004; (g), r = −0.080, P = 0.486) and exposed group ((f), r = −0.405, P < 0.001; (h), r = −0.523, P < 0.001), respectively; correlation between CTL and IgG, IgA level in lymphocytes of workers in control group ((i), r = −0.126, P = 0.270; (k), r = −0.110, P = 0.339) and exposed group ((j), r = −0.312, P < 0.001; (l), r = −0.350, P < 0.001), respectively.