In contrast, evaluation of conventional expiratory flow FeNO 50 measurements [16.0 (11.0–23.0) ppb in AECOPD group; 17.0 (12.5–27.0) ppb in COPD group; 16.0 (12.0–22.3) ppb in healthy control group] failed to reach statistical significance ( P = 0.334, Figure 1a ).
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Analysis of exhaled nitric oxide and its influencing factors in patients with chronic obstructive pulmonary disease.
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0.3340
0.3340