Fig. 1

Estrogen and testosterone levels during ovarian stimulation in different groups. (A-B) Estrogen level on the day when follicles of different diameters first showed up and estrogen levels when follicles over 18 mm in diameter were present on the trigger day. Data were shown as mean ± standard deviation. * in Fig. 1A represents P < 0.05 among the modified letrozole group and others. (C-D) Testosterone levels on the day when follicles of different diameters first showed up and testosterone levels when follicles over 18 mm in diameter were present on the trigger day. Data were shown as mean ± standard deviation. * P < 0.05 between or among groups. (E-F) Correlation analysis between number of oocytes retrieved or number of MII oocytes retrieved and testosterone levels on the trigger day in the modified letrozole group