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(a) Days between the LF visit and ovulation in participants using the standard (SOT) and advanced ovulation test (AOT). (b) Estradiol in the early (EF) and late follicular (LF) phase when the LF phase visit was scheduled using an SOT or AOT. There was a main effect of phase such that E2 was greater in the LF vs. EF phase. (c) Relationship between LF visit testing and ovulation interval and change in estradiol across the menstrual cycle (LF‐EF).
