Table 3.

Subgroup analysis: CRT vs. no CRT

	De novo CRT subgroup (n = 44)		ICD or CRT > 1 year (n = 24)
	Pre‐activation period	Post‐activation period	Pre‐activation period	Post‐activation period	P for interaction
Total number of HF hospital admissions	20	5**	7	2**	0.888
Number of patients hospitalized for HF (%)	16 (36%)	5 (11%)**	5 (21%)	2 (8%)**	0.787
Mean number HF hospital admissions per patient	0.45	0.11*	0.29	0.08*	0.481
Mean HF hospital length of stay in days	17.9	7.8	8.2	5.0	0.576
Total number of 1 day clinic visits	16	32	16	10	0.673
Mean number of 1 day clinic visits per patient	0.36	0.73	0.67	0.42	0.673
Number of patients with 1 day clinic visits (%)	13 (29%)	14 (32%)	11 (46%)	5 (21)*	0.305
Total number of ambulatory visits	93	89	39	28	n/a
Mean number of ambulatory visits per patient	2.11	1.62	2.02	1.17	0.082

CRT, cardiac resynchronization therapy; HF, heart failure; ICD, implantable cardiac defibrillator.

Data are presented as mean (±standard deviation) or numbers (%).

^* P < 0.05.

^** P < 0.01 for pre‐activation and post‐activation difference within the same subgroup.