Fig. 2

The unadjusted pregnancy rates and early miscarriage rates among the women in the different AMH and age groups. A χ2 testing showed that in the ≥ 35-years age group, the pregnancy rate was significantly higher in the medium (1.61–3.98 ng/ml) AMH group than that in the low (0.06–1.60 ng/ml) or high (3.99–20.20 ng/ml) AMH group. However, in the < 35-years age group, the pregnancy rate of the different AMH groups were not significantly different. B χ2 testing showed that in the < 35-years age group, the early miscarriage rate was significantly lower in the medium AMH group than in the low or high AMH group. However, in the ≥ 35-years age group, the early miscarriage rates of the different AMH groups were not significantly different