Figure 1
Ovulatory & Perimenopausal E2 and αPg. Linear plots of premenopausal (A–C) and perimenopausal (D–F) E2 and αPg. Mean ± standard deviation E2 (solid) and αPg (dashed) concentrations for premenopausal (A) and perimenopausal cycles (D) within one week of LH surge onset (N = 16 out of 45 premenopausal cycles, and N = 4 out of 10 perimenopausal cycles). # Indicates significantly elevated pre-LH E2 concentrations (premenopausal p = 5.5 × 10–5; perimenopausal non-significant p = 0.391), and * indicates significantly elevated αPg after LH surge onset (premenopausal p = 4.71 × 10–31; perimenopausal, p = 0.028). Blue bars and text and indicate percent of cycles showing an LH surge a given number of days after onset, beginning on the day marked “LH” (e.g., 26% indicates that 26% of individuals were still surging on the 3rd day after LH surge onset). Representative E2 (gray) and αPg (black) from premenopausal (C) and perimenopausal (F) individuals relative to LH surge onset, and cycle mid-point, respectively.
