A significantly greater proportion of women with AMH ≤ 2.25 ng/mL had regular periods compared with women in average-AMH and high-AMH groups (81.2% vs. 65.5% and 40.2%, respectively; P < 0.001), whereas the proportion of women with amenorrhea was significantly greater in women with AMH > 5.71 ng/mL compared with low-AMH and average-AMH groups (7.8% vs. 0.3% and 1.1%, respectively; P < 0.001). This evidence concerns the gene AMH and amenorrhea.