Full test characteristics
| Model | Sensitivity (95% CI) | Specificity (95% CI) | PPV (95% CI) | NPV (95% CI) | Under-triage (95% CI) | Over-triage (95% CI) |
| Entire study population (n=127 233) | ||||||
| Triage Sort | 15.9% (15.5% to 16.4%) | 98.6% (98.6% to 98.7%) | 73.9% (72.7% to 75.0%) | 82.9% (82.7% to 83.1%) | 84.1% (83.6% to 84.5%) | 26.1% (25.8% to 26.4% |
| NARU Sieve | 29.5% (28.9% to 30.1%) | 93.6% (93.4% to 93.7%) | 52.7% (51.8% to 53.5%) | 84.6% (84.4% to 84.8%) | 70.5% (69.9% to 71.1%) | 47.3% (47.0% to 47.6%) |
| MPTT-24 | 53.5% (52.9% to 54.1%) | 74.8% (74.6% to 75.1%) | 34.0% (33.5% to 34.5%) | 86.9% (86.7% to 87.2%) | 46.5% (45.9% to 47.1%) | 66.0% (65.7% to 66.3%) |
| Low falls removed (n=58 879) | ||||||
| Triage Sort | 17.3% (16.7% to 17.9%) | 98.7% (98.5% to 98.8%) | 84.8% (83.6% to 85.9%) | 73.2% (72.8% to 73.6%) | 82.7% (82.1% to 83.2%) | 15.2% (14.9% to 15.6%) |
| NARU Sieve | 32.0% (31.3% to 32.7%) | 92.8% (92.5% to 93.0%) | 65.9% (64.9% to 66.2%) | 75.7% (75.4% to 76.1%) | 68.0% (67.4% to 68.7%) | 34.1% (33.6% to 34.5%) |
| MPTT-24 | 57.3% (56.5% to 58.0%) | 71.1% (70.7% to 71.6%) | 46.4% (45.8% to 47.1%) | 79.2% (78.6% to 79.6%) | 42.8% (42.0% to 43.5%) | 53.6% (53.1% to 54.1%) |
MPTT-24, Modified Physiological Triage Tool-24; NARU, National Ambulance Resilience Unit; NPV, negative predictive value; PPV, positive predictive value;