INS and polycystic ovary syndrome: In the PCOS group, a moderate positive correlation was found between BMI and leptin concentrations (r = 0.7176; p < 0.0001) and carbohydrate metabolism parameters, such as insulin (r = 0.5524; p = 0.0003), glucose (r = 0.3843; p = 0.0157), HOMA-IR index (r = 0.5895; p = < 0.0001) and IRI/glucose (r = 0.3872; p = 0.0163).