Table 1. Etiology of secondary dysmenorrhea cases.
| Number of Cases | % of Cases | |
| Primary dysmenorrhea | 172 | 80.0 |
| Secondary dysmenorrhea | 43 | 20.0 |
| Etiology | ||
| Ovarian cyst | 28 | 13.0 |
| Endometriosis | 4 | 1.9 |
| Myoma | 2 | 0.9 |
| Endometrial polyps | 1 | 0.5 |
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