Mean concentration in µg/ml of 5 heavy metals in semen samples of oligozoospermia males of different age groups. Mean bar values of 1, 2, 3, 4 and 5 specify mean values of Cd, Cr, Pb, Cu and Zn respectively in age groups 18-23, 24-29, 30-35, 36-41, 42-47 and above-47, Dark blue, Blue, Light-blue, Yellow, Pink-red and Dark-red bars are for 18-23, 24-29, 30-35, 36-41, 42-47 and above-47 years of age groups, respectively.