FEV1 % of predicted mean ± 1SD for participants with <10% relative FEV1 (L) response during PEx treatment (black lines, n=35) and participants ≥10% relative FEV1 (L) response during treatment (gray lines, n=67): best during 6 months before study PEx, at time of IV initiation for PEx, at end of IV for PEx, and best during 3 months after study PEx.