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Table 1 Respondent characteristics related to menstrual history (n = 156)

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  
  <25 days 20 (13)
  25–35 days 106 (68)
  >35 days 30 (19)
History of painful menses 82 (53)
Using medicinal contraception 52 (33)