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Table 2 Agreement between woman-selected estimated date of ovulation and blinded expert review according to the peak day method of fertility tracking

From: Pilot test and validation of the Peak Day method of prospective determination of ovulation against a handheld urine hormone monitor

       Scenario
  Woman selected EDO Woman selected EDO excluding women who previously used a fertility awareness-based method Woman selected EDO excluding cycles for which basal body temperature was recorded
Window in relation to EDO as assessed by expert review using the “last fertile sign” algorithm1 Cycles n = 110 n = 82 n = 67
Exact day n(%) 84 (76) 64 (78) 52 (78)
± 1 day n(%) 90 (82) 68 (83) 56 (84)
± 2 days n(%) 96 (87) 72 (88) 59 (88)
± 3 days n(%) 102 (93) 76 (93) 61 (91)
Window in relation to EDO as assessed by expert review using the “best quality” algorithm2 Cycles n = 20 n = 10 n = 9
Exact day n(%) 18 (90) 8 (80) 7 (78)
± 1 day n(%) 19 (95) 9 (90) 8 (89)
± 2 days n(%) 20 (100) 10 (100) 9 (100)
  ± 3 days n(%) 20 (100) 10 (100) 9 (100)
  1. Abbreviations: EDO (estimated day of ovulation).
  2. 1Last day during a menstrual cycle when a woman observed any of the three fertile-type cervical fluid characteristics.
  3. 2Last day during a menstrual cycle when a woman observed the most number of fertile-type cervical fluid characteristics.