From: Gastrointestinal symptoms before and during menses in healthy women
Menstrual information | Mean (SD) |
---|---|
Age at first menses | 12.9 (1.8) |
Menses duration in days | 5.7 (3.3) |
 | n (%) |
Cycle duration | Â |
  <25 days | 20 (13) |
  25–35 days | 106 (68) |
  >35 days | 30 (19) |
History of painful menses | 82 (53) |
Using medicinal contraception | 52 (33) |