Table 1.

Parameters on which studies based the definition of eumenorrhea

	Number of studies (n = 7)	Range
Number of MCPs per year	1	10–12 menses per year[57]
Consistency of MCPs	2	Consistent over 6 consecutive months [58] Occur at intervals of ≥ 38 days [59]
Duration of cycle	2	26–30 days [60] 24–38 days [58]
Duration of menses or other phase	2	Interval from menses to the luteinising hormone surge is consistent to 14 ± 1 days [61] > 8 days of menses [58]

MCP menstrual cycle phase