PCSK9 and diabetes mellitus: The hazard increment associated with high levels of PCSK9 was still significant but attenuated in the whole cohort (> 50.4 ng/mL, HR: 1.616, 95% CI 1.148–2.273, P = 0.006) and non-DM patients (> 139.1 ng/mL, HR: 2.037, 95% CI 1.202–3.448, P = 0.008) when stratified by the optimal thresholds of each subgroup.