Table 2.

Diagnostic Performance Measures per Triage Category for the Deep Neural Network in the Panel‐Annotated Validation Data Set

	Normal	Abnormal, Not Acute	Abnormal, Subacute	Abnormal, Acute
C‐statistic (95% CI)	0.95 (0.94 to 0.96)	0.91 (0.89–0.93)	0.94 (0.90–0.97)	0.94 (0.90–0.96)
PDI (95% CI)	0.91 (0.87–0.93)	0.80 (0.75–0.84)	0.82 (0.75–0.88)	0.80 (0.73–0.87)
Sensitivity	0.87	0.76	0.64	0.79
Specificity	0.88	0.89	0.98	0.94
Positive predictive value	0.85	0.83	0.78	0.55
Negative predictive value	0.90	0.84	0.97	0.98

The c‐statistics, sensitivities, specificities, positive and negative predictive values are calculated in a 1‐vs‐other approach and compare the category with the highest probability to the reference standard. The PDI estimates the probability that a patient from that category is correctly identified from a set of cases from every category. C‐statistic indicates concordance statistic, equivalent to area under the receiver operating characteristic curve; and PDI, polytomous discriminatory index.