Independent predictors of SWI were insulin‐treated DM (OR: 3.343 [95% CI, 1.188–9.409]; P=0.022), COPD (OR: 3.563 [95% CI, 1.616–7.855]; P=0.002), and repeat operations (OR: 4.379 [95% CI, 1.428–13.375]; P=0.010). Here, INS is linked to diabetes mellitus.