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. 2020 Aug 17;28:81. doi: 10.1186/s13049-020-00766-1

Table 3.

Prehospital triage according to RETTS-A compared with a reference patient

All Female Male ≤ 65 yrs >  65 yrs
n 4465 2319 2146 2034 2431
Sensitivity 0.806 0.782 0.830 0.867 0.774
[0.778,0.834]a [0.740,0.824] [0.791,0.867] [0.826,0.906] [0.737,0.810]
Specificity 0.644 0.668 0.616 0.585 0.702
[0.621,0.666] [0.638,0.699] [0.583,0.648] [0.553,0.618] [0.672,0.732]
PPV 0.486 0.477 0.495 0.379 0.586
[0.459,0.515] [0.439,0.516] [0.457,0.534] [0.342,0.418] [0.548,0.622]
NPV 0.888 0.888 0.889 0.938 0.851
[0.871,0.905] [0.864,0.910] [0.863,0.913] [0.918,0.956] [0.825,0.876]
LR + 2.26 2.36 2.16 2.09 2.60
[2.11,2.43] [2.13,2.63] [1.96,2.38] [1.91,2.30] [2.32,2.90]
LR - 0.30 0.33 0.28 0.23 0.32
[0.26,0.35] [0.26,0.39] [0.22,0.34] [0.16,0.30] [0.27,0.38]
AUROCb 0.725 0.725 0.723 0.726 0.738
[0.707,0.745] [0.699,0.751] [0.698,0.748] [0.701,0.752] [0.714,0.762]
Accuracy 0.692 0.700 0.683 0.649 0.727
[0.674,0.710] [0.675,0.725] [0.656,0.709] [0.621,0.676] [0.704,0.751]
Overtriage 0.356 0.332 0.384 0.415 0.298
[0.334,0.378] [0.304,0.362] [0.351,0.417] [0.383,0.446] [0.269,0.329]
Undertriage 0.194 0.218 0.170 0.133 0.226
[0.167,0.222] [0.176,0.261] [0.133,0.209] [0.094,0.176] [0.189,0.263]

PPV positive predictive value, NPV negative predictive value, LR Likelihood ratio, AUROC Area under the reciever operating characteristic curve

a Bootstrapped 99% confidence intervals

b Calculated on AUROC curve predefined sensitivity and specificity based on cutoffs in RETTS-A triage levels Red and Orange