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Receiver operating characteristic (ROC) curve for postoperative plasma factor XIII activity in the EF and inEF groups. Area under the curve (AUC) = 0.751. The calculated optimal cut-off point for factor XIII activity on the fifth postoperative day to distinguish effectiveness of exogenous factor XIII concentrate administration was 86% (Youden Index = 0.535); the overall sensitivity was 80.7% and the overall specificity was 72.7%.
