Comparison of HA incidence between PCOS IR and non‐IR subgroups identified using different IR‐relevant parameters#. The incidence of HA was assessed by (A) LCMS‐based TT (≥ 1.85 nmol/L), (B) CLIA‐based TT (≥ 2.39 nmol/L), (C) LCMS‐based TT or mFG score (TT ≥1.85 nmol/L or mFG ≥5), and (D) mFG score alone (≥ 5). AN, acanthosis nigricans; HIN, hyperinsulinemia; HOMA‐IR, fasting glucose (mmol/L) × fasting insulin (mIU/L)/22.5, homeostatic model assessment of IR; IGT, impaired glucose tolerance; IFG, impaired fasting glucose; IR, insulin resistance;. *P < 0.05; **P < 0.01; ***P < 0.001. #The numbers of subjects were 332 for IFG, HIN, and HOMA‐IR, 210 for IGT, 204 for INS peak shift and 178 for AN