Table 3.

Model discrimination in derivation and validation cohorts

Model	Derivation cohort			Validation cohort
	AUROC (95% CI)	Brier score		AUROC (95% CI)	Brier score
4C Mortality Score	0.786 (0.781 to 0.790)	0.170		0.767 (0.760 to 0.773)	0.171
Machine learning comparison*	0.796 (0.786 to 0.807)	0.191		0.779 (0.772 to 0.785)	0.197

AUROC=area under receiver operator curve; CI=confidence interval.

^*Gradient boosting decision tree (XGBoost).