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A multicenter, randomized, partially blinded, placebo-controlled clinical trial to evaluate the effect on primary dysmenorrheal of vaginal rings with an average daily release of 700 µg nomegestrol acetate (NOMAC) and 300 µg estradiol (E2), or 900 µg nomegestrol acetate (NOMAC) and 300 µg estradiol (E2), or 100 µg etonogestrel (ENG) and 300 µg E2, or 125 µg etonogestrel (ENG) and 300 µg E2

To identify at least one New Generation Ring that shows clinically relevant treatment efficacy:• in relief of primary dysmenorrhea, as demonstrated by a statistically significantly larger reduction (as compared to baseline) in the mean menstrual…