Fig. 4From: The use of the mannitol test as an outcome measure in asthma intervention studies: a review and practical recommendations(adapted from Brannan et al. [26])Airway responsiveness to mannitol: PD15 values calculated for individual patients alongside geometric means. Mean values (95% CI error bars) before and after treatment with budesonide (Rx). â—‹ indicates where PD15 values were not attained (635 mg value imputed)Back to article page