NPPB and diabetes mellitus: The results revealed that BMI (r = 0.243, p = 0.009), NT-proBNP (r = 0.512, p = 0.001), RVEDd (r = 0.292, p = 0.001), RAD (r = 0.188, p = 0.039), hypertension (r = 0.216, p = 0.017) and diabetes mellitus (r = 0.245, p = 0.007) were positively correlated and age (r = −0.212, p = 0.02) and HDL-C (r = −0.187, p = 0.04) were negatively correlated with the AHI.