Risk Factors for Predicting Mortality and Amputation of Patients with Necrotizing Soft-Tissue Infections: Retrospective Analysis of 111 Cases from a Single Medical Center

Table 10

ROC and AUC of patients with NTSI for amputation.

ROC curve	Mann–Whitney				Somers’ D (Gini)	Gamma	Tau-a	Cut-off	Sensitivity	Specificity
	AUC	SD	95% CI
Model	0.8535	0.0390	0.7771	0.9299	0.7070	0.7073	0.3329	0.044	0.838	0.809
Age	0.7126	0.0533	0.6082	0.8170	0.4251	0.4326	0.2002	63.5	0.622	0.73
Hb	0.6810	0.0535	0.5761	0.7859	0.3621	0.3651	0.1705	105	0.556	0.784
Wounds	0.7570	0.0444	0.6699	0.8440	0.5139	0.8150	0.2420	—	0.784	0.730
ROC4	0.5000	0	0.5000	0.5000	0		0

NSTIs, necrotizing soft-tissue infections; ROC, receiver operating characteristics; AUC, area under the ROC curve; SD, standard derivation; CI, confidence interval; Hb, hemoglobin.