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Table 1 Preoperative characteristics of the study subjects*.

From: Preoperative ejection fraction as a predictor of survival after coronary artery bypass grafting: comparison with a matched general population

Variables Group 1 (EF > 50%) (n = 8204) Group 2 (EF = 35% -50%) (n = 1717) Group 3 (EF < 35%) (n = 364) P Value
Age (y) (mean ± SD) 64.5 ± 9.5 65.0 ± 9.7 65.6 ± 8.9 0.014
Male sex (%) 6254 (76.2) 1382 (80.5) 297 (81.6) < 0.0001
NYHA class III or IV (%) 436 (5.3) 142 (8.3) 53 (14.6) < 0.0001
Angina class (mean ± SD) 2.7 ± 1.2 2.6 ± .3 2.3 ± 1.5 0.012
Hypertension (%) 3554 (43.3) 649 (37.8) 127 (34.9) < 0.0001
COPD (%) 987 (12.0) 258 (15.0) 58 (15.9) < .0001
Diabetes (%) 1692 (20.6) 413 (24.1) 96 (26.4) < 0.0001
1 Prior MI (%) 2635 (32.3) 1016 (59.3) 204 (56.0) < 0.0001
2 Prior MIs (%) 280 (3.4) 167 (9.7) 55 (15.1) < 0.0001
> 2 Prior MIs (%) 25 (0.3) 15 (0.9) 6 (1.6) < 0.0001
CrCl < 60 mL/min (%) 2168 (27.4) 568 (34.4) 152 (44.4) < 0.0001
PVD (%) 908 (11.1) 239 (13.9) 51 (14.0) 0.002
Emergency (%) 237 (2.9) 71 (4.1) 33 (9.1) < 0.0001
Prior cardiac surgery (%) 384 (4.7) 154 (9.0) 39 (10.7) < 0.0001
  1. EF = Ejection fraction, NYHA = New York Heart Association, COPD = chronic obstructive pulmonary disease, MI = myocardial infarction, CrCl = creatinine clearance, PVD = peripheral vascular disease.
  2. *Data are represented as number (percent) or as the mean ± SD.