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Risk intervals of severe hypoxemia based on the nomogram and clinical practice.
| Risk intervals | Low risk (<215 points) | Medium risk (215–251 points) | High risk (>251 points) |
| Estimated probability (%) | <10 | 10–30 | >30 |
| Observed probability, % (95% CI) | 5.2 (4.8–5.6) | 18.8 (18.0–19.7) | 48.3 (46.0–50.7) |
| No. of patients (%) | 153 (31.1) | 179 (36.4) | 160 (32.5) |
CI, confidence interval.
