GDF9 and polycystic ovary syndrome: The age (35.9 versus 32.7, P 0.001), infertility time (4.1 versus 3.8,p=0.705), antral follicle count (8.5 versus 16.3,p<0.001), AMH (1.0 versus 3.1,p<0.001) were found in No POS Group and POS Group, respectively.The presence of homozygosis mutant of GDF9 (c.398-39 C>G) was: Control Group 7.0%versus PCOS Group 0.0%, p=0.327.