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Prevalence of regular and irregular menstrual cycles in relation to the age at menarche (≤ or > 14 yrs).
| Regular | Irregular | Rowtotal | |
|---|---|---|---|
| Menarche ≤ 14 yrs (%) | 35 (70) | 11 (38) | 46 (58.2) |
| Menarche > 14 yrs (%) | 15 (30) | 18 (62) | 33 (41.8) |
| Column total (%) | 50 (63,3) | 29 (36,7) | 79 (100) |
| χ2 test, p: 0,005 |
