The multiple linear regression analysis performed on the total group of 172 subjects showed that (a) the values of FSH were dependent on the age, working life, job category (traffic policemen or roadmen), log UCd and on the log concentrations of BCd (respectively R2 = 0.252, p = 0.000 and R2 = 0.321, p = 0.000; Table 5); (d) the values of LH were dependent on the age and working life variables (respectively R2 = 0.242, p = 0.000 and R2 = 0.323, p = 0.000; Table 6) (e) the values of testosterone were not dependent on the all variables studied ( Table 7).