Differential Clinical Significance of FENO₂₀₀ and CANO in Asthma, Chronic Obstructive Pulmonary Disease (COPD), and Asthma-COPD Overlap (ACO).

In the asthma group, FENO 50 exhibited significant or near-significant negative correlations with pulmonary function parameters such including FEV 1 /FVC (ρ = −0.241, P < 0.05), MMEF (ρ = −0.239, P < 0.05), MEF50 (ρ = −0.029, P < 0.05) and MEF25 (ρ = −0.215, P = 0.054).

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