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Receiver operating characteristic (ROC) curve analysis for ciliary beat frequency (CBF) and nasal nitric oxide (nNO) for predicting a diagnosis of primary ciliary dyskinesia (PCD) (using multidisciplinary diagnosis as the reference standard). ROC curve analysis showed that nNO ≤30 nL·min−1 (area under the curve (AUC) 0.97, 95% CI 0.94–1.00) was superior to CBF (AUC 0.92, 95% CI 0.79–1.00) as predictors of a PCD-positive diagnosis.
