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Fig. 4 | Respiratory Research

Fig. 4

From: Dysregulation of the endothelial nitric oxide pathway is associated with airway inflammation in COPD

Fig. 4

Sputum nitrate and nitrite concentration in COPD. Sputum nitrate and nitrite concentrations were analysed between patients with stable and exacerbated COPD (a and c; unpaired t-test, *p < 0.05), and between the onset and the recovery of an acute severe exacerbation (b and d; paired t-test, &p = 0.06). S-COPD: stable COPD, E-COPD: exacerbation of COPD. Data were analysed after log transformation and are shown as geometric mean and geometric standard deviation

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