VDR and polycystic ovary syndrome: We found a significant association of the VDR gene ApaI rs7975232 (A > C) polymorphism with PCOS susceptibility in the allelic (C vs. A: OR = 1.19, 95%CI = 1.06~1.34, P = 0.004), recessive (CC + CA vs. AA: OR = 1.20, 95%CI = 1.01~1.42, P = 0.042) and dominant (CC vs. CA + AA: OR = 1.35, 95%CI = 1.09~1.69, P = 0.008) genetic models in the overall populations.