ATS category Prevalence % | AUC (95% CI) | Sensitivity (95% CI) | Specificity (95% CI) | Positive predictive value (95% CI) | Negative predictive value (95% CI) | Pretest odds | LR+ (95% CI) | LR− (95% CI) |
---|---|---|---|---|---|---|---|---|
ATS 1 26% | 0.471 (442 to 0.501) | 0.651 (0.621 to 0.675) | 0.207 (0.155 to 0.267) | 0.224 (0.221 to 0.231) | 0.628 (0.564 to 0.689) | 0.351 | 0.288 (0.267 to 0.312) | 0.592 (0.452 to 0.774) |
ATS 2 60% | 0.567 (0.528 to 0.574) | 0.646 (0.626 to 0.662) | 0.376 (0.334 to 0.419) | 0.618 (0.600 to 0.636) | 0.404 (0.373 to 0.436) | 1.50 | 1.56 (1.45 to 1.69) | 1.39 (1.22 to 1.59) |
ATS 3 71% | 0.533 (0.662 to 0.670) | 0.651 (0.622 to 0.670) | 0.415 (0.369 to 0.463) | 0.730 (0.713 to 0.747) | 0.324 (0.296 to 0.353) | 2.45 | 2.72 (2.50 to 2.97) | 2.06 (1.81 to 2.35) |
ATS 4 56% | 0.502 (0.469 to 0.527) | 0.643 (0.587 to 0.695) | 0.350 (0.330 to 0.378) | 0.558 (0.517 to 0.597) | 0.439 (0.417 to 0.461) | 1.27 | 1.29 (1.18 to 1.41) | 1.24 (1.06 to 1.46) |
ATS 5 4% | 0.457 (0.397 to 0.517) | 0.651 (0.622 to 0.675) | 0.268 (0.158 to 0.403) | 0.357 (0.305 to 0.418) | 0.948 (0.922 to 0.966) | 0.041 | 0.037 (0.031 to 0.043) | 0.054 (0.035 to 0.084) |
ATS overall | 0.712 (0.676 to 0.741) | 0.586 (0.554 to 0.599) | 1.17 |
ATS, Australasian Triage Scale; AUC, area under the curve; LR, likelihood ratio.