Figure 1

Proportion of patients who demonstrated bronchodilator responsiveness by number of clinic visits according to criteria A, B, and C. The histograms on the most left (0) reflect percent of patients who never met the criteria for responsiveness while the ones on the most right (10) reflect the subjects who on all the 10 occasions of testing met the reversibility criteria. Population restricted to the patients randomized to placebo group and who had spirometry performed at all 10 spirometry clinic visits.