Table 4

Diagnostic accuracy for the ATS categories in identifying severe sepsis

ATS category
Prevalence %
AUC
(95% CI)
Sensitivity
(95% CI)
Specificity
(95% CI)
Positive predictive value (95% CI)Negative predictive value (95% CI)Pretest oddsLR+
(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)0.3510.288 (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)1.501.56 (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)2.452.72 (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)1.271.29 (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)0.0410.037 (0.031 to 0.043)0.054 (0.035 to 0.084)
ATS overall0.712 (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.