Table 4.

All-Cause and Cardiovascular Mortality Risk in Men of the First Quartile of Baseline QTVi

Variables	All-Cause Mortality				Cardiovascular Mortality				Noncardiovascular Mortality
	Univariate Analysis		Multivariable Analysis		Univariate Analysis		Multivariable Analysis		Univariate Analysis		Multivariable Analysis
	HR (95% CI)	P Value	HR (95% CI)	P Value	HR (95% CI)	P Value	HR (95% CI)	P Value	HR (95% CI)	P Value	HR (95% CI)	P Value
Continuous QTVi	1.05 (0.95-1.16)	.306	0.98 (0.89-1.08)	.743	1.18 (0.99-1.41)	.068	1.12 (0.93-1.35)	.217	1.00 (0.89-1.13)	.967	0.92 (0.82-1.04)	.194
QTVi greater than –0.96	1.31 (1.01-1.70)	.047	1.12 (0.86-1.48)	.391	2.02 (1.25-3.26)	.004	1.89 (1.14-3.14)	.013	1.08 (0.78-1.49)	.641	0.91 (0.65-1.27)	.579

Multivariable analysis was adjusted for age, history of stroke, atrial fibrillation, myocardial infarction/coronary artery disease, congestive heart failure, transient ischemic attack, diabetes, hypertension, COPD, asthma and Parkinson disease, mean heart rate, mean respiratory rate, physical activity scale for elderly, systolic and diastolic BPs, time of sleep spent below 90% oxygen saturation, BMI, apnea-hypopnea index, arousal index, average corrected QT, arousal burden, and drink and smoking habit. Boldface indicates a P value with statistical significance. QTVi = QT variability index.