The genotype frequencies of VDR-ApaI, VDR-Fokl and VDR-Taql gene polymorphisms were in agreement with the Hardy–Weinberg equilibrium in the women-without-PCOS group (VDR-ApaI: pHWE = 1.000, VDR-Fokl: pHWE = 1.000, VDR-Taql: pHWE = 0.719). The gene discussed is VDR; the disease is polycystic ovary syndrome.