Table 1.

Main characteristic and outcomes among Medicare beneficiaries receiving primary ICD implantations (N=66,974)

Median Age (y) (IQR)	75(71–80)
Male	48,853(73)
White	58,916(88)
Median EF % (IQR)	25(20–30)
HF Duration
New HF	7,965(12)
0–3 months	9,389(14)
3–9 months	8,652(13)
>9 months	40,175(61)
Missing (N)	793
NYHA class
I	3,926(6)
II	20,647(31)
III	38,667(58)
IV	3,384(5)
Missing (N)	350
QRS ≥ 120 msec	42,269(63)
Ischemic cause HF	53,232(79)
≥1 Prior hospitalization for any cause	18,752 (28)
≥5 Prior hospitalization for any cause	2,624 (4)
Cardiac Resynchronization Therapy - Defibrillators	32,201(48)
Outcomes
Death (N)	11,876
In-hospital death (N)	327
In hospital death risk(%) (95% CI)	0·49 (0·45–0·55)
Average follow-up(range)	1·4 (0 day–4 yrs)
Mortality rate (per 1,000 person-year)	128
1-yr mortality risk(%) (95% CI)	12 (12–13)
2-yr mortality risk(%) (95% CI)	22 (22–23)
3-yr mortality risk(%) (95% CI)	31 (30–32)