FIGURE 2.

a) Mean adherence to weekly home spirometry. Adherence to weekly home spirometry was calculated as the number of weeks that a subject provided at least one measurement divided by the number of weeks that they were followed in the trial. b) Proportion of subjects with 100% adherence to weekly home spirometry. 100% adherence was defined as provision of at least one measurement per week for all the weeks that the subject was in the trial. The total number of subjects who were still followed in the trial within the time period was used as the denominator.