AMH and precocious puberty: Ten studies (n = 922 participants) were included in the meta-analysis of serum AMH level of precocious puberty (Fig. 2C), and there was significant heterogeneity among the studies (I2 = 77%; P < 0.0001).There was no significant association between precocious puberty and the level of serum AMH (SMD: -0.32; 95% CI: -0.23 to 0.36; P = 0.66).