Table 2.

Summary of menstrual cycle data of women who became pregnant

Days	n	Pregnancies ongoing >10 weeks
Ovulation day	59	16 (11–39)
Menstrual cycle length	69	28 (21–60)
Implantation day	58	27 (23–44)

Values are median (range) unless specified. Ovulation and implantation day relate to the cycle, in which the volunteer achieved pregnancy. Menstrual cycle length is calculated from the study cycles prior to pregnancy. Where women became pregnant in first cycle, no menstrual cycle length data are available

n Number where complete information available