ROC curve analysis of plasma gelsolin concentration for identifying patients with 6-month unfavorable outcome. ROC curves were constructed based on the sensitivity and specificity of the plasma gelsolin concentration for identifying 6-month unfavorable outcome. The AUC was calculated based on the ROC curves and expressed as 95% CI. AUC ranges from 0.5 to 1.0. An AUC closer to 1 indicates a higher predictive power.