In nonobese PCOS, BMI additionally correlated with properdin (r = 0.58, p = 0.001), iC3b (r = 0.46, p = 0.01), C3 (r = 0.56, p = 0.002), C3adesArg (r = 0.5, p = 0.001), C3a (r = 0.53, p = 0.003), C4 (r = 0.46, p = 0.01), C5 (r = 0.39, p = 0.04) and C1q (r = 0.54, p = 0.02). Here, CFP is linked to polycystic ovary syndrome.