Patient demographics and preoperative characteristics in both the full data set and the reduced, matched data set
| Variables | All patients | P value | Matched data set | P value | |||
| PCI, n=1090 | No PCI, n=10 241 | PCI, n=1058 | No PCI, n=1058 | ||||
| Age (0) | 64 (56–71) | 66 (59–72) | <0.001 | 64 (56–71) | 63 (56–71) | 0.25 | |
| BMI (4) | 28.0 (25.4–30.9) | 27.7 (25.1–30.7) | 0.012 | 28.0 (25.4–30.9) | 27.9 (25.1–31.2) | 0.63 | |
| Male (0) | 81.10% | 80.10% | 0.47 | 80.90% | 80.90% | >0.99 | |
| Angina (0) | CCS 1 | 25.90% | 25.90% | 25.80% | 24.50% | ||
| CCS 2 | 33.20% | 36.70% | 33.40% | 32.70% | |||
| CCS 3 | 28.90% | 25.60% | 29.10% | 29.80% | |||
| CCS 4 | 12.00% | 11.80% | 0.054 | 11.70% | 13.00% | 0.74 | |
| NYHA (4) | NYHA 1 | 34.40% | 36.70% | 34.50% | 34.40% | ||
| NYHA 2 | 37.60% | 36.70% | 37.80% | 37.60% | |||
| NYHA 3 | 24.80% | 23.20% | 24.60% | 24.60% | |||
| NYHA 4 | 3.20% | 3.30% | 0.44 | 3.10% | 3.40% | 0.99 | |
| No previous MI’s (0) | None | 26.40% | 52.90% | 25.50% | 26.70% | ||
| One | 51.70% | 38.30% | 52.50% | 50.10% | |||
| Two or more | 21.90% | 8.80% | <0.001 | 22% | 23.30% | 0.55 | |
| Smoking status (0) | Never smoked | 28.80% | 29.20% | 28.90% | 30.40% | ||
| Ex-smoker | 60.10% | 59.30% | 60.20% | 58.20% | |||
| Current smoker | 11.00% | 11.60% | 0.79 | 10.90% | 11.30% | 0.65 | |
| Hypertension (3860) | (treated) | 43.20% | 21.70% | <0.001 | 72.90% | 73.30% | 0.84 |
| History of pulmonary disease (1) | 13.30% | 12.80% | 0.67 | 13.00% | 14.60% | 0.34 | |
| Neurological history (182) | CVA | 2.90% | 2.40% | 2.90% | 3.20% | ||
| TIA | 4.30% | 5.30% | 0.22 | 4.40% | 4.30% | 0.93 | |
| Extracardiac arteriopathy (1) | 14.80% | 15.70% | 0.47 | 14.60% | 16.10% | 0.37 | |
| Pre-op heart rhythm (242) | Sinus rhythm | 95.00% | 94.20% | 94.80% | 94.60% | ||
| Pacing block | 0.60% | 0.70% | 0.70% | 0.70% | |||
| VT/ VF | 1.00% | 0.70% | 1.00% | 0.70% | |||
| Other abnormal rhythm | 0.60% | 1.00% | 0.45 | 0.70% | 1.00% | 0.75 | |
| Ejection fraction (706) | Good | 34.40% | 54.00% | 76.80% | 77.30% | ||
| Fair | 49.10% | 37.30% | 19.20% | 18.40% | |||
| Poor | 3.60% | 3.20% | <0.001 | 4.00% | 4.3%% | 0.87 | |
| EuroScore (48) | 3 (2–5) | 3 (2–5) | 0.4 | 3 (2–5) | 3 (2–5) | 0.76 | |
| Priority (0) | Elective | 70.30% | 71.30% | 70.40% | 70.50% | ||
| Urgent | 26.10% | 26.80% | 26.00% | 26.40% | |||
| Emergency | 3.70% | 1.90% | <0.001 | 3.60% | 3.10% | 0.83 | |
| No of distal arteries (0) | 0–1 | 9.00% | 4.10% | 8.90% | 8.90% | ||
| 2 | 31.20% | 21.40% | 31.60% | 33.00% | |||
| 3 | 44.60% | 47.00% | 44.80% | 42.40% | |||
| Propensity score | 4 or more mean | 15.1% 0.159 | 27.5% 0.092 | <0.001 | 14.7% 0.159 | 15.7% 0.159 | 0.73 |
Non-normality of all continuous variables (age, BMI, Euroscore) was confirmed using a Kolmogorov-Smirnov test and are hence presented as median (Q1, Q3). P values in bold font indicate a significant global test of difference between groups.
BMI, body mass index; CCS, Canadian cardiovascular society grading for angina pectoris; CVA, cerebrovascular accident; MI, myocardial infarction; NYHA, New York Heart Association; PCI, percutaneous coronary intervention; TIA, transient ischaemic attack; VF, ventricular fibrillation; VT, ventricular tachycardia.