Table 5. Cox Proportionate Hazards Analysis for the composite endpoint^*.

	Univariate		Multivariate
	Hazard Ratio [C.I.]	p	Hazard Ratio [C.I.]	p
Surgical lead	1.3 [1.0, 1.7]	0.08	1.3 [1.0, 1.7]	0.07
Ischemic cardiomyopathy	1.3 [1.1, 1.5]	0.005	1.2 [1.0, 1.4]	0.09
History atrial arrhythmia	1.2 [1.0, 1.3]	0.16	1.1 [1.0, 1.3]	0.17
Ejection fraction ≤ 20%	1.2 [1.0, 1.4]	0.03	1.2 [1.0, 1.5]	0.02
Age	1.0 [1.0, 1.0]	0.34	1.0 [1.0, 1.0]	0.28
Male Gender	1.2 [1.0, 1.5]	0.08	1.1 [0.9, 1.4]	0.34

^*Analysis restricted to patients who underwent LV lead-only surgical procedures; patients with concomitant bypass or valve procedures were excluded.