Fig. 5From: The value of serum Krebs von den lungen-6 as a diagnostic marker in connective tissue disease associated with interstitial lung diseaseThe ROC curve for serum KL-6 level for usefulness evaluation. The area under the curve is 0.81. When the cut-off value is set to 617.73 IU/ml, sensitivity (0.82) and specificity (0.72) reach the maximum, which is the best working pointBack to article page