Table 5. HRs for mortality with ICD insertion in subgroups of matched population.

Variables		No. of patients	HR (95% CI)	P value	Interaction P value
Etiology of HF					0.069
	Ischemic	41	0.20 (0.06–0.72)	0.013
	Non-ischemic	69	0.81 (0.29–2.29)	0.680
Sex					0.785
	Male	92	0.46 (0.19–1.08)	0.074
	Female	18	0.34 (0.06–1.74)	0.195
Diabetes mellitus					0.897
	Yes	56	0.40 (0.15–1.04)	0.059
	No	54	0.43 (0.11–1.76)	0.243
Hypertension					0.300
	Yes	58	0.67 (0.23–1.93)	0.455
	No	52	0.25 (0.08–0.84)	0.025
Chronic kidney disease					0.209
	Yes	14	1.09 (0.24–4.96)	0.914
	No	96	0.36 (0.15–0.87)	0.023
Atrial fibrillation					0.719
	Yes	28	0.30 (0.03–2.58)	0.273
	No	85	0.44 (0.19–1.01)	0.052
Type of heart failure					0.271
	De novo	48	0.22 (0.04–1.08)	0.062
	ADHF	62	0.60 (0.25–1.44)	0.251

Hazard ratios for all-cause mortality associated with ICD implantation.

HR = hazard ratio, ICD = indicates implantable cardioverter-defibrillator, CI = confidence interval, HF = heart failure, ADHF = acute decompensated heart failure.