The distribution of CAG repeats in the subgroups of infertile/subfertile men and of fertile controls is shown in Figure 3. The range of CAG repeat number, mean CAG repeat length and median for all subgroups is given in Table 1. Mean CAG length did not differ between the subgroups of infertile/subfertile males and the fertile controls. The percentages of long CAG repeats (defined at the cut offs: >26, >27 and >28) are given in Table 2. The highest number of long CAG repeats was found in patients with mild oligozoospermia, the difference being statistically significant when compared to fertile controls.