Figure 2. Subgroup analysis from a parallel arm, randomised, placebo-controlled clinical trial with multiple imputations for missing values: forest plot of treatment reporting ORs for visual analogue scores of mean average breathlessness response at days 5–7 compared with baseline by subgroup on an intention to treat basis. (A) 15% improvement over baseline. (B) 8.9mm improvement over baseline. n=284. COPD, chronic obstructive pulmonary disease; mMRC, modified Medical Research Council breathless scale.