AMH and Infertility: The mean age (33.21 ± 4.85 vs. 31.89 ± 4.71 y, P<0.001), the percentage of parity (24.57 vs. 16.51%, P<0.001), and the percentage of women with a history of PTB (2.73 vs. 1.30, P=0.001) were all higher, while the proportion of primary infertility (37.32 vs. 41.79%, P=0.010), the duration of infertility (3.31 ± 2.77 vs. 3.56 ± 2.82 y, P=0.015), serum AMH level (4.26 ± 3.24 vs. 5.30 ± 3.85 ng/ml, P<0.001), and AFC (10.70 ± 5.46 vs. 12.70 ± 6.03, P<0.001) were all lower in the EMT <8 mm group, compared with those in EMT ≥8 mm.