Table 5.
Processes of care and outcomes in the propensity matched pairs. Values are expressed as number (percentage) unless otherwise indicated
| Stress testing (n=23 060) | No stress testing (n=23 060) | Difference (95% CI) | |
|---|---|---|---|
| Preoperative cardiac procedure* | |||
| Coronary angiogram | 1139 (4.9) | 549 (2.4) | RR 2.08 (1.88 to 2.92) |
| Percutaneous coronary intervention | 288 (1.2) | 132 (0.6) | RR 2.18 (1.78 to 2.68) |
| Aorto-coronary bypass surgery | 267 (1.2) | 213 (0.9) | RR 1.25 (1.05 to 1.50) |
| Postoperative care† | |||
| Admission to a monitored bed | 6175 (26.8) | 5682 (24.6) | RR 1.09 (1.06 to 1.12) |
| Mechanical ventilation | 2672 (11.6) | 2596 (11.3) | RR 1.02 (0.98 to 1.08) |
| Outcome | |||
| One year mortality | 1622 (7.0) | 1738 (7.5) | HR 0.92 (0.86 to 0.99) |
| In-hospital postoperative death | 310 (1.3) | 366 (1.6) | RR 0.85 (0.73 to 0.98) |
| Surgical site infection | 1815 (7.9) | 1807 (7.8) | RR 1.00 (0.94 to 1.07) |
Abbreviations: HR, hazard ratio; RR, relative risk.
*Within 180 days before surgery.
†Within 5 days after surgery.