Menstrual cycle characteristics, and the mean levels of AMH, AFC and FSH of the participants diagnosed with occult POI at initial assessment and one-year follow up.

Serum AMH level and AFC were significantly decreased and FSH level was significantly increased at one-year follow-up of the participants with occult POI compared to their corresponding values at initial assessment. The mean cycle length was significantly shortened and the number of the participants menstruating every 21 days were significantly increased compared to the initial assessment. While none of the participants diagnosed with occult POI had reported any skipped menses in the first assessment, now six of them reported one missed period at one-year follow-up.