AMH and precocious puberty: As for detection reagent, in the subgroup with detection reagent of Beckman Coulter (P = 0.50) and the subgroup with detection reagent of others (P = 0.80), the AMH level was not associated with precocious puberty. The heterogeneity of the subgroup with detection reagent of Beckman Coulter decreased (I2 = 19%).