Table 5 Cox proportional hazards model of the cumulative risk of major cardiovascular events two years after percutaneous coronary intervention, Scotland, 1997–2003.
| Crude | Adjusted for case mix* and year | |||
|---|---|---|---|---|
| HR (95% CI) | p Value | HR (95% CI) | p Value | |
| All‐cause death | ||||
| Low volume | 1.00 | 1.00 | ||
| Medium volume | 0.97 (0.82 to 1.15) | 0.723 | 1.05 (0.83 to 1.33) | 0.681 |
| High volume | 1.11 (0.90 to 1.37) | 0.319 | 0.85 (0.57 to 1.26) | 0.414 |
| Acute myocardial infarction | ||||
| Low volume | 1.00 | 1.00 | ||
| Medium volume | 0.85 (0.73 to 0.99) | 0.041 | 1.02 (0.82 to 1.27) | 0.872 |
| High volume | 0.86 (0.70 to 1.06) | 0.150 | 0.85 (0.58 to 1.27) | 0.431 |
| Coronary artery bypass grafting | ||||
| Low volume | 1.00 | 1.00 | ||
| Medium volume | 0.63 (0.55 to 0.72) | <0.001 | 0.62 (0.51 to 0.76) | <0.001 |
| High volume | 0.45 (0.37 to 0.56) | <0.001 | 0.52 (0.35 to 0.75) | 0.001 |
| Percutaneous coronary intervention | ||||
| Low volume | 1.00 | 1.00 | ||
| Medium volume | 1.22 (1.10 to 1.35) | <0.001 | 1.49 (1.29 to 1.73) | <0.001 |
| High volume | 1.00 (0.87 to 1.15) | 0.996 | 1.55 (1.20 to 1.99) | 0.001 |
| Coronary revascularisation | ||||
| Low volume | 1.00 | 1.00 | ||
| Medium volume | 0.98 (0.90 to 1.06) | 0.599 | 1.11 (0.98 to 1.25) | 0.104 |
| High volume | 0.79 (0.70 to 0.88) | <0.001 | 1.04 (0.84 to 1.29) | 0.729 |
| Any event | ||||
| Low volume | 1.00 | 1.00 | ||
| Medium volume | 0.96 (0.89 to 1.03) | 0.226 | 1.07 (0.96 to 1.19) | 0.219 |
| High volume | 0.84 (0.76 to 0.92) | <0.001 | 1.01 (0.84 to 1.22) | 0.918 |
*Model adjusted for age, sex, urgency, indication, number of stenosed arteries, left ventricular impairment, previous coronary revascularisation, diabetes, smoking status, obesity, hypertension, hyperlipidaemia and deprivation quintile.
HR, hazard ratio.