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Predicted and observed invasive mechanical ventilation (IMV) rates observed with ABC2-SPH score.
| Risk groups | Score | Predicted IMV rate | Number of patients classified in each risk group | Number of IMV patients | Observed rate of IMV |
|---|---|---|---|---|---|
| Low | 0–1 | <6.0% | 2,108 (22.5%) | 183 | 8.7% |
| Intermediate | 2–4 | 6.0–14.9% | 3,489 (37.3%) | 634 | 18.2% |
| High | 5–8 | 15–49.9% | 2,970 (31.8%) | 1,115 | 37.5% |
| Very high | ≥ 9 | ≥50% | 783 (8.4%) | 429 | 54.8% |
| Overall | - | - | 9,350 (100%) | 2,361 | 25.3% |
