Table 3. The 30-, 90-, and 180-Day Mortality by OSSa.
| Mortality | OSS 1 (n = 44 545) | OSS 2 (n = 226 754) | OSS 3 (n = 129 846) | OSS 4 (n = 28 751) | OSS 5 (n = 2932) |
|---|---|---|---|---|---|
| 30 d | |||||
| Deaths, No. | 168 | 762 | 2541 | 905 | 103 |
| Mortality rate by RAI, % (95% CI)b | |||||
| ≤20 | 0.04 (0.01-0.08) | 0.09 (0.07-0.11) | 0.30 (0.25-0.35) | 0.88 (0.70-1.09) | 2.03 (1.08-3.44) |
| 21-29 | 0.22 (0.16-0.30) | 0.29 (0.26-0.33) | 0.91 (0.83-0.99) | 1.89 (1.67-2.12) | 2.83 (2.08-3.76) |
| 30-39 | 1.55 (1.20-1.97) | 1.85 (1.62-2.11) | 5.13 (4.79-5.48) | 6.98 (6.20-7.83) | 6.14 (4.15-8.70) |
| ≥40 | 10.34 (7.73-13.48) | 10.12 (8.71-11.67) | 18.74 (17.72-19.80) | 22.26 (19.99-24.66) | 7.77 (4.42-12.95) |
| Overall mortality rate, % (95% CI) | 0.38 (0.32-0.44) | 0.34 (0.31-0.36) | 1.96 (1.88-2.03) | 3.15 (2.95-3.36) | 3.51 (2.88-4.24) |
| 90 d | |||||
| Deaths, No. | 529 | 1963 | 5132 | 1631 | 188 |
| Mortality rate by RAI, % (95% CI)b | |||||
| ≤20 | 0.22 (0.16-0.30) | 0.22 (0.19-0.24) | 0.58 (0.52-0.65) | 1.64 (1.39-1.92) | 4.06 (2.67-5.89) |
| 21-29 | 0.84 (0.72-0.82) | 0.76 (0.70-0.82) | 2.05 (1.93-2.16) | 3.73 (3.43-4.05) | 5.10 (4.09-6.29) |
| 30-39 | 4.79 (4.17-5.48) | 5.28 (4.88-5.69) | 10.95 (10.47-11.44) | 12.98 (11.94-14.08) | 11.65 (8.90-14.90) |
| ≥40 | 22.84 (19.10-26.93) | 22.63 (20.65-24.72) | 34.04 (32.80-35.31) | 34.74 (32.11-37.44) | 12.44 (8.13-17.94) |
| Overall mortality rate, % (95% CI) | 1.19 (1.09-1.29) | 0.87 (0.83-0.90) | 3.95 (3.85-4.06) | 5.67 (5.41-5.95) | 6.41 (5.55-7.36) |
| 180 d | |||||
| Deaths, No. | 1076 | 3469 | 7429 | 2312 | 298 |
| Mortality rate by RAI, % (95% CI)b | |||||
| ≤20 | 0.54 (0.44-0.65) | 0.43 (0.40-0.46) | 1.03 (0.94-1.12) | 2.69 (2.37-3.04) | 5.93 (4.23-8.05) |
| 21-29 | 1.97 (1.78-2.17) | 1.45 (1.37-1.53) | 3.29 (3.15-3.44) | 5.78 (5.41-6.18) | 8.61 (7.29-10.08) |
| 30-39 | 9.40 (8.54-10.32) | 9.19 (8.68-9.72) | 16.22 (15.65-16.80) | 18.03 (16.83-19.28) | 18.43 (15.04-22.23) |
| ≥40 | 34.91 (30.58-39.44) | 31.92 (29.68-34.21) | 43.00 (41.69-44.32) | 41.97 (39.23-44.75) | 17.10 (12.07-23.17) |
| Overall mortality rate, % (95% CI) | 2.42 (2.27-2.56) | 1.53 (1.48-1.58) | 5.72 (5.60-5.85) | 8.04 (7.73-8.36) | 10.2 (9.09-11.31) |
Abbreviations: OSS, Operative Stress Score; RAI, Risk Analysis Index.
a
The categories are defined as follows: OSS 1, very low stress; OSS 2, low stress; OSS 3, moderate stress; OSS 4, high stress; and OSS 5, very high stress.
b
The Risk Analysis Index is based on the accumulation of deficits model of frailty and uses 14 variables to generate a score from 0 to 81, with higher scores indicating more frailty.