Table 3. Comparison of the Longitudinal Study of ICDs (LSICD) Cohort with a US National Sample of Primary Prevention ICD Recipients in 2006-2007.

Variable	LSICD	NCDR National
N	2621	110,455
Age (yrs) at implant	66.7 (11.6)	67.7 (12.5)¶
Female gender	663 (25.3%)	30014 (27.2%)∼
Non-white race	858 (32.7%)	20925 (18.9%)¶
History of heart failure	2513 (95.9%)	93717 (84.9%)¶
NYHA Class		¶
I	299 (11.4%)	8917 (8.1%)
II	1235 (47.1%)	38887 (35.3%)
III	1026 (39.1%)	57617 (52.2%)
IV	55 (2.1%)	5034 (4.6%)
LVEF (%)	24.9 (6.9)	25.1 (8.1)
Ischemic heart disease	1670 (63.7%)	72718 (65.8%)∼
Previous CABG	811 (30.9%)	39615 (35.9%)¶
Previous PCI	799 (30.5%)	35475 (32.1%)
Chronic lung disease	508 (19.4%)	24667 (22.3%)¶
Diabetes	1099 (41.9%)	41936 (38.0%)¶
Hypertension	1916 (73.1%)	82431 (74.6%)
Atrial fibrillation or flutter	823 (31.4%)	33759 (30.6%)
LBBB	710 (27.1%)	32289 (29.2%)∼
Non-sustained VT	366 (14.0%)	23683 (21.4%)¶
Creatinine (mg/dL)	1.5 (2.9)	1.4 (1.1)
Systolic blood pressure	124.3 (20.3)	129.77 (22.1)¶
Medications
ACE-inhibitor	1739(66.6%)	69231 (64.7%)¶
ARB	549 (21.0%)	18542 (17.1%)¶
Aspirin	1756(67.3%)	71542 (65.7%)∼
Beta Blocker	2385(91.4%)	94777 (87.0%)¶
Coumadin	834 (32.0%)	30563 (27.9%)¶
Digoxin	784 (30.0%)	32229 (29.3%)
Statin	2025(77.6%)	68307 (62.3%)¶

Notes:

^∼= p<0.05;

§ = p<0.01;

^¶= p<0.001;

all continuous variables listed as means and standard deviations;

^*medications at discharge after ICD placement

Abbreviations: ACE=angiotensin converting enzyme; ARB=angiotensin receptor blocker; CABG=coronary artery bypass graftsurgery; LBBB=left bundle branch block; LVEF=left ventricular ejection fraction; NYHA=NewYork Heart Association; PCI=percutaneous coronary intervention; VT=ventricular tachycardia.