Variable SF–stream–level (pg./dl) Cut off level 825 pg./ml Sensitivity (%) 50% Specificity (%) 70% Positive predictive value (%) 64% Negative predictive value (%) 64% Kappa Index 0.28 Area under the ROC Curve 0.603 (0.448–0.757)

Table 1: Statistical variables for SF /STREM–1 level.