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Receiver operator characteristics curves for mortality prediction for patients over 50. A. The c-statistic for in-hospital mortality using Elastic net LR in patients older than 50 had an AUC of 0.73, 95% CI: 0.61 to 0.84 in the internal validation cohort. B. In the external validation cohort the model had an AUC of 0.82 (95% CI: 0.7 to ,0.87)
