INS and type 2 diabetes mellitus: Taking NGR as a reference, isolated IGT, combined IFG and IGT, and type 2 diabetes were all risk factors for prolonged QTc.The OR of IGT for QTc prolongation was 1.131 (95% CI 1.059–1.356), the OR of IFG + IGT for QTc prolongation was 1.396 (95% CI 1.126–1.73), and the OR of T2DM for QTc prolongation was 1.34 (95% CI 1.142–1.577) (P for trend < 0.001) after adjusting for age, sex, insulin, SBP, DBP, CHOL, TG, smoking, and drinking (Table 5).