Per cent incidence of risk factors in each centre with 95% CI for coronary artery bypass graft only (4929 patients)
| Field | Centre 1 (1159 patients) | Centre 2 (2173 patients) | Centre 3 (1403 patients) | Centre 4 (1693 patients) | p Value (χ2)3-150 |
| Current smoker | 7 (5.3 to 8.3) | 14 (12.8 to 15.8) | 13 (11.2 to 14.8) | 9 (7.3 to 10.0) | < 0.0001 |
| Ejection fraction < 50% | 34 (31.4 to 36.9) | 45 (42.4 to 46.6) | 35 (32.6 to 37.6) | 24 (22.0 to 26.1) | < 0.0001 |
| Hypercholesterolaemia | 61 (58.1 to 63.8) | 67 (65.4 to 69.4) | 77 (74.2 to 78.7) | 67 (65.0 to 69.0) | < 0.0001 |
| Intravenous nitrates | 13 (10.9 to 14.9) | 8 (6.9 to 9.2) | 10 (8.2 to 11.4) | 4 (3.3 to 5.3) | < 0.0001 |
| Non-elective operation | 33 (30.2 to 35.7) | 20 (18.6 to 22.1) | 27 (23.9 to 28.6) | 14 (12.8 to 16.2) | < 0.0001 |
| Redo operation | 4 (2.7 to 4.9) | 3 (2.1 to 3.6) | 7 (5.7 to 8.5) | 4 (2.9 to 4.8) | < 0.0001 |
| Respiratory failure | 13 (10.9 to 14.9) | 29 (27.2 to 31.1) | 9 (7.8 to 10.9) | 11 (9.9 to 13.0) | < 0.0001 |
| Unstable symptoms | 33 (29.9 to 35.3) | 18 (16.8 to 20.1) | 27 (25.0 to 29.7) | 17 (15.3 to 18.9) | < 0.0001 |
| Peripheral vascular disease | 15 (13.1 to 17.3) | 12 (10.7 to 13.5) | 11 (9.1 to 12.4) | 8 (6.5 to 9.1) | < 0.0001 |
| Age > 70 years | 19 (17.3 to 21.9) | 21 (19.1 to 22.5) | 16 (13.7 to 17.6) | 15 (13.2 to 16.7) | < 0.0001 |
| Previous cardiological intervention | 10 (8.8 to 12.4) | 7 (6.0 to 8.2) | 7 (5.4 to 8.1) | 5 (4.1 to 6.2) | < 0.0001 |
| Female sex | 20 (17.7 to 22.4) | 19 (17.7 to 21.0) | 24 (22.0 to 26.6) | 20 (18.3 to 22.1) | 0.003 |
| Renal failure | 1 (0.8 to 2.3) | 1 (0.9 to 2.0) | 2 (1.4 to 2.9) | 3 (2.2 to 3.8) | 0.003 |
| Cardiogenic shock | 1 (0.7 to 2.1) | 0.4 (0.2 to 0.8) | 0.6 (0.3 to 1.2) | 0.1 (0 to 0.5) | 0.008 |
| Cerebrovascular disease | 9 (7.5 to 10.9) | 9 (7.4 to 9.8) | 7 (5.7 to 8.5) | 7 (5.5 to 7.9) | 0.03 |
| Hypertension | 43 (40.5 to 46.3) | 45 (42.6 to 46.8) | 40 (37.7 to 42.9) | 44 (41.3 to 46.1) | 0.07 |
| Ventilated | 0.3 (0.1 to 1.0) | 0.2 (0.1 to 0.6) | 0.1 (0 to 0.5) | 0 (0 to 0.2) | 0.08 |
| Previous Q wave MI | 51 (47.8 to 53.6) | 49 (46.4 to 50.7) | 47 (44.3 to 49.6) | 50 (47.3 to 52.1) | 0.2 |
| Diabetes | 15 (12.6 to 16.8) | 15 (13.6 to 16.6) | 16 (13.8 to 17.6) | 14 (12.0 to 15.3) | 0.4 |
| Failed intervention | 1 (0.4 to 1.6) | 0.6 (0.3 to 1.0) | 0.8 (0.4 to 1.4) | 0.4 (0.2 to 0.9) | 0.6 |
| BMI > 35 (kg/m2) | 5 (3.9 to 6.6) | 4 (3.5 to 5.2) | 4 (3.2 to 5.3) | 5 (3.6 to 5.6) | 0.7 |
↵3-150 The p value refers to a comparison of the incidence of risk factors across the four centres.
BMI, body mass index; MI, myocardial infarction.