Table 2. Association Between RAI Score and Number of Complications Stratified by Procedural Risk.
| RAI Scorea,b | Relative Risk (95% CI) | |
|---|---|---|
| Major Complication | Any Complication | |
| Low-risk, 1 complication | ||
| 11-20 | 2.19 (1.60-2.98) | 2.12 (1.57-2.85) |
| 21-30 | 3.23 (2.32-4.50) | 2.88 (2.10-3.96) |
| 31-40 | 5.35 (3.65-7.84) | 4.32 (2.98-6.24) |
| >40 | 9.44 (5.42-16.45) | 6.47 (3.73-11.20) |
| Low-risk, 2 complications | ||
| 11-20 | 4.18 (3.71-4.72) | 3.09 (2.81-3.40) |
| 21-30 | 9.23 (7.86-10.84) | 6.32 (5.53-7.21) |
| 31-40 | 19.66 (15.00-25.76) | 10.52 (8.16-13.56) |
| >40 | 42.95 (25.05-73.64) | 24.59 (14.96-40.41) |
| Low-risk, ≥3 complications | ||
| 11-20 | 4.42 (2.79-7.01) | 4.33 (2.78-6.72) |
| 21-30 | 8.32 (5.20-13.32) | 8.74 (5.62-13.58) |
| 31-40 | 17.82 (10.88-29.16) | 20.67 (13.02-32.84) |
| >40 | 19.46 (8.45-44.77) | 26.68 (13.87-51.31) |
| High-risk, 1 complication | ||
| 11-20 | 1.40 (0.96-2.06) | 1.36 (1.00-1.86) |
| 21-30 | 1.62 (1.10-2.38) | 1.46 (1.06-1.99) |
| 31-40 | 1.88 (1.27-2.77) | 1.60 (1.16-2.20) |
| >40 | 2.31 (1.52-3.52) | 1.95 (1.38-2.77) |
| High-risk, 2 complications | ||
| 11-20 | 2.27 (2.18-2.37) | 1.93 (1.87-2.00) |
| 21-30 | 3.63 (3.47-3.80) | 2.76 (2.65-2.87) |
| 31-40 | 5.81 (5.48-6.17) | 4.02 (3.80-4.25) |
| >40 | 8.99 (8.14-9.93) | 5.50 (4.99-6.07) |
| High-risk, ≥3 complications | ||
| 11-20 | 2.06 (1.66-2.56) | 2.09 (1.74-2.50) |
| 21-30 | 3.46 (2.77-4.31) | 3.60 (3.00-4.34) |
| 31-40 | 5.25 (4.14-6.65) | 5.34 (4.38-6.52) |
| >40 | 6.23 (4.72-8.23) | 6.98 (5.53-8.80) |
Abbreviation: RAI, Risk Analysis Index.
a
All comparisons are vs the group with RAI scores of 10 or less.
b
Low-risk procedures were defines as having a postoperative mortality rate of less than 1%, and high-risk procedures were defined as having a postoperative mortality rate of 1% or higher.