Effect of 21-day and 24-day oral contraceptive regimens containing gestodene (60 μg) and ethinyl estradiol (15 μg) on ovarian activity Helen Sullivan, M.D., Hilary Furniss, Jurgen Spona, Ph.D., Max Elstein, M.D. Fertility and Sterility Volume 72, Issue 1, Pages 115-120 (July 1999) DOI: 10.1016/S0015-0282(99)00205-8
FIGURE 1 Mean diameter of largest follicle-like structure with 21- and 24-day regimens. ■, 7-day pill-free interval; ■, 4-day placebo-pill interval; --○--, 24-day; –■–, 21-day. Fertility and Sterility 1999 72, 115-120DOI: (10.1016/S0015-0282(99)00205-8)
FIGURE 2 Mean serum 17-β-E2 concentration with 21- and 24-day regimens. ■, 7-day pill-free interval; ■, 4-day placebo-pill interval; --○--, 24-day; –■–, 21-day. Fertility and Sterility 1999 72, 115-120DOI: (10.1016/S0015-0282(99)00205-8)