Figure 3From: Azithromycin and cough-specific health status in patients with chronic obstructive pulmonary disease and chronic cough: a randomised controlled trialTime to first exacerbation COPD. Kaplan Meier curves showing the proportion of patients with a first exacerbation against time in days for the azithromycin (n = 42) and placebo (n = 42) group.Back to article page