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ROC curve for serum ADMA levels; ROC curve analysis evaluated optimal cutoff values of serum ADMA levels for predicting new occurrences of PAH (3(a) cutoff value = 0.810 μmol/L) and moderate to severe PAH ((b) cutoff value = 0.995 μmol/L) in CTD patients. ROC curve: receiver operating characteristic curve; AUC: area under the curve.
