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Receiver-operating characteristic (ROC) curve analysis was performed to differentiate between patients with asymptomatic and symptomatic asthma. The analysis included different cut-off points of the fraction of exhaled nitric oxide (FeNO) measurements obtained by NIOX (blue line) and RuiBreath (green line) in differentiating symptomatic asthma patients. The area under the curve (AUC) values of NIOX and RuiBreath measurements were 0.661 (P<0.001) and 0.680 (P<0.001), respectively.
