Figure 7
From: Persistence of oxidant and protease burden in the airways after smoking cessation
Exhaled fractional nitric oxide (FeNO) in the combined groups of chronic bronchitis and COPD (COPD), asthma (A) and asymptomatic smokers (S). Individual subgroups are presented as corresponding symbols and shown in the panels. Only 8-isoprostane in the combined group showed a significant decline (p = 0.035) after smoking cessation calculated with Wilcoxon signed rank test. The number of the analyses was lower than the total number of subjects who succeeded in smoking cessation due to unrepresentative sputum specimen during the control visit.