Fig. 2From: Association of red cell distribution width with pulmonary arterial hypertension in patients with mixed connective tissue diseaseThe ROC curve of diagnostic accuracy with RDW for predicting the presence of PAH in MCTD patients. An RDW value > 15.2% was 80.4% sensitive and 82.2% specific for diagnosing PAH, with an AUC of 0.9 (95% confidence interval: 0.835–0.949; P < 0.001). Youden index was 0.6Back to article page