In this study, the prevalence of QTc interval prolongation in patients with T2DM was 21.9%, which is slightly lower than the prevalence reported by a previous observation by Li X et al, which other studies also exhibited diversity according to the definition of QT interval prolongation, heart rate correction method, or participants’ age, sex ratio, DM duration, and use of insulin. Here, INS is linked to type 2 diabetes mellitus.