През периода между Ден 9 и 21 на това проучване има понижение до 64% в междинните концентрации на етинил естрадиол и понижение до 60% в междинните концентрации на норетиндрон.
During days 9 through 21 in this study, there was as much as a 64% decrease in ethinyl estradiol trough concentrations and as much as a 60% decrease in norethindrone trough concentrations.