| Causes | Population | Frequency (%) |
| Uterin | ||
| ・ Fibroids | 58 | 41.8 |
| ・ Synechiae | 9 | 6.5 |
| ・ Polyps | 7 | 5.0 |
| Hormonal | ||
| ・ Ovarians | 17 | 12.2 |
| ・ Hypothalamo-pituitary | 5 | 3.6 |
| ・ Mixed | 5 | 3.6 |
| Tubal obstructions | 7 | 5.0 |
| Cervico vaginal | ||
| ・ Cervical secretion abnormalities | 4 | 2.9 |
| ・ Infibulation (genital mutilation) | 2 | 1.4 |
| ・ Vaginal stenosis | 1 | 0.7 |
| Ovariancystsorganic | 5 | 3.6 |
| Endometriosis | 5 | 3.6 |
| Multiples causes | ||
| ・ Fibroids + vaginal stenosis | 5 | 3.6 |
| ・ Fibroids + Hyperprolactinemia | 9 | 6.5 |
| Total | 139 | 100.0 |