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Baseline menstrual characteristics
| Age at menarche (years) | 12.8 ± 1.4 |
| Cycle length (days) | 29.4 ± 7.6 |
| Days of bleeding | 5.1 ± 1.3 |
| Usual menstrual flow | |
| Light | 62 (28.3) |
| Moderate | 129 (58.9) |
| Heavy | 38 (17.3) |
| Dysmenorrhea | |
| None | 30 (13.7) |
| Mild | 55 (25.1) |
| Moderate | 101 (46.1) |
| Severe | 33 (15.1) |
| Limitation in daily activities | 41 (18.7) |
Note: Values are presented as mean ± standard deviation or as n (%).
