Table 3.
Accuracy of the risk-scoring model using the cut-off values.
| Performance metrics | Development cohort | External validation cohort | ||
|---|---|---|---|---|
| Low risk | High risk | Low risk | High risk | |
| Total, N (%) | 23,508 (67.9) | 11,134 (32.1) | 7537 (69.1) | 3365 (30.9) |
| Predicted score (mean, range) | (2.2, 0–6) | (13.8, 7–35) | (2.2, 0–6) | (13.9, 7–31) |
| Actual ED visit, N (% of subgroup) | 843 (3.6) | 1958 (17.6) | 291 (3.9) | 590 (17.5) |
| Sensitivity, % (95% CI) | 69.9 (68.2–71.6) | 67.0 (63.9–70.1) | ||
| Specificity, % (95% CI) | 71.2 (70.7–71.7) | 72.3 (71.4–73.2) | ||
ED emergency department.