INS and endometriosis: While we found significantly lower serum basal testosterone (T) [0.50(0.00–0.80) vs 0.60(0.00–0.90) nmol/L, P = 0.005], higher serum INS [6.90(5.10–9.50) vs 6.50(4.80–8.90) μU/mL, P = 0.005], TC [4.35(3.92–4.80) vs 4.27(3.81–4.77) mmol/L, P = 0.036], HDL-C [1.36(1.19–1.57) vs 1.32(1.14–1.52) mmol/L, P = 0.005] and LDL-C [2.63(2.17–3.01) vs 2.54(2.12–2.94) mmol/L, P = 0.043] in endometriosis group compared with controls.