Neutropenia groups represent severity of first episode of neutropenia. Time to CLAD is shown for patients with A) mild, b) moderate and c) severe neutropenia. For patients with mild neutropenia, GCSF administration was associated with a near significant increased risk for CLAD development (aHR 3.49, 95% CI 0.93–13.04, p=0.063). There were no significant differences in CLAD development for patients with moderate neutropenia, but patients with severe neutropenia who received GCSF had a near significant decreased risk for CLAD development according to whether or not they received GCSF (aHR 0.25, 95% CI 0.06–1.02, p=0.053).