MMP9 and polycystic ovary syndrome: The differences in age, clinical characteristics and biochemical parameters among the PCOS subjects, grouped on the basis of their BMI, are shown in Table I. PCOS subjects with BMI > 30 kg/m2 had significantly higher levels of MMP-9 (p = 0.029) compared to those with BMI between 25 and 28 kg/m2.