Table 2. Unadjusted and Adjusted Survival Differences Between ICD and Control Groups at Five Years by Number of Comorbidities.

No. of Comorbidities	Unadjusted		Adjusted
	Median Survival Difference (ICD – Control)	95% CI	Median Survival Difference (ICD – Control)	95% CI
0	0.11	(0.05 to 0.17)	0.13	(0.06 to 0.19)
1	0.12	(0.07 to 0.18)	0.13	(0.07 to 0.19)
2	0.13	(0.08 to 0.18)	0.13	(0.08 to 0.18)
3	0.11	(0.06 to 0.16)	0.11	(0.06 to 0.15)
4	0.06	(-0.01 to 0.14)	0.06	(0.00 to 0.14)
5	0.00	(-0.13 to 0.12)	0.00	(-0.10 to 0.12)
6	-0.06	(-0.19 to 0.07)	-0.05	(-0.18 to 0.09)

No patient had all 7 comorbidities. Posterior probability of interaction between treatment and comorbidity, p < 0.01 (unadjusted and adjusted).

CI = confidence interval; ICD = implantable cardioverter-defibrillator.