| Causes (n = 97) | Type | n | % |
| Central origin 3 (3%) | Micropenis Prolactine adenoma | 1 2 | 33.3 66.7 |
| Testicular origin 52 (53.6%) | Congenital AMT Herniorrhaphy Varicocele Orchitis Testiculare torsion | 09 23 12 06 02 | 17.3 44.2 23.1 11.6 3.8 |
| Lesion of the upper urinary tract 5 (5.1%) | Vasectomy | 05 | 100 |
| Other 37 (38.1%) | Not determined | 37 | 100 |