Fig. 5

Comparison of exacerbations for COPD between the two groups of patients before and after treatment. A Total exacerbations and B hospitalisations for COPD at baseline and 12 months after treatment. Mean values are shown for all subjects for whom data were available at the given timepoints, error bars are 95% CI. *P < 0.05 compared with the 12 months before treatment. ^ΔP < 0.05 compared with the control group (P < 0.05). BT bronchial thermoplasty