Table 4. Hosmer And Lemeshow Test And Area Under The ROC Curve For Pre- And Postoperative All-Cause In-Hospital Mortality In South African Vascular Surgical Patients.

	Percentage correct in cohort		p-value	Area under ROC curve (validation cohort)
Model	Derivation (%)	Validation (%)
Pre-operative model	88.2	91.2	0.291	0.583
Postoperative model	91.2	92.9	0.454	0.879