Table 2.
Mortality and major morbidity in low, medium and high SORT risk groups. All odds ratios and 95% confidence intervals (CIs) reflect a pairwise comparison with the low risk group and have a significance level of P<0.001. SORT, Surgical Outcome Risk Tool; IQR, inter-quartile range.
| Low risk SORT <1.52% n=42 705 | Medium risk SORT 1.52–3.92% n=5516 | High risk SORT >3.92% n=5174 | |
|---|---|---|---|
| Mean predicted 30-day mortality (%) | 0.394 | 2.46 | 9.84 |
| Median predicted 30-day mortality (%) | 0.266 | 2.38 | 6.63 |
| Observed 30-day mortality, n (%) | 59 (0.14) | 74 (1.34) | 425 (8.21) |
| Odds ratio (95% CI) | 11.1 (7.45–16.6) | 98.2 (54.7–176) | |
| Any hospital-acquired complication, n (%) | 1203 (2.82) | 694 (12.6) | 1110 (21.5) |
| Odds ratio (95% CI) | 5.20 (4.67–5.79) | 10.3 (9.23–11.5) | |
| Healthcare associated infection, n (%) | 635 (1.49) | 384 (6.96) | 519 (10.0) |
| Odds ratio (95% CI) | 5.20 (4.52–5.99) | 7.98 (6.96–9.16) | |
| Delirium, n (%) | 200 (0.47) | 156 (2.83) | 330 (6.38) |
| Odds ratio (95% CI) | 6.31 (5.07–7.85) | 15.3 (12.5–18.7) | |
| Cardiac complications, n (%) | 141 (0.33) | 120 (2.18) | 218 (4.21) |
| Odds ratio (95% CI) | 6.71 (5.25–8.58) | 13.3 (10.7–16.4) | |
| Respiratory complications, n (%) | 144 (0.34) | 112 (2.03) | 202 (3.90) |
| Odds ratio (95% CI) | 6.27 (4.84–8.12) | 12.6 (9.84–16.1) | |
| Venous thromboembolism, n (%) | 88 (0.21) | 36 (0.65) | 45 (0.87) |
| Odds ratio (95% CI) | 3.18 (2.16–4.69) | 4.25 (2.96–6.09) | |
| Gastrointestinal bleeding, n (%) | 27 (0.06) | 21 (0.38) | 45 (0.87) |
| Odds ratio (95% CI) | 6.04 (3.41–10.7) | 13.9 (8.59–22.4) | |
| Surgical complications requiring unplanned return to theatre, n (%) | 76 (0.18) | 36 (0.65) | 44 (0.85) |
| Odds ratio (95% CI) | 3.74 (2.48–5.64) | 4.98 (3.37–7.35) | |
| Renal failure | 4 (0.01) | 8 (0.15) | 18 (0.35) |
| 15.5 (4.67–51.4) | 37.2 (12.6–110) | ||
| ICU admission, n (%) | 1339 (3.14) | 751 (13.6) | 1023 (19.8) |
| Odds ratio (95% CI) | 5.46 (4.86–6.13) | 9.17 (8.11–10.4) | |
| Length of hospital stay in days, median (IQR) [range] | 2.0 (1.2–4.2) [0.1–283.6] | 5.1 (2.3–9.2) [0.2–300.0] | 6.6 (3.9–12.1) [0.1–211.1] |
| Coefficient, (95% CI) | 0.723 (0.693–0.754) | 1.01 (0.986–1.04) | |
| DAH-30, median (IQR) [range] | 29 (26–29) [0–30] | 25 (18–28) [0–30] | 20 (6–25) [0–30] |
| Coefficient, (95% CI) | –5.00 (–5.25 to –4.75) | –10.0 (–10.3 to –9.75) |