Results of multivariable models. For the models describing factors associated with time to macroscopic hematuria resolution or time to resolution of all cystitis symptoms, an HR <1 is associated with lower likelihood of resolution of disease at any given time point and thus a longer duration of disease. All cell counts reported in cells/µL. ^aMultivariable model is adjusted for CMV serostatus and duration of cystitis symptoms prior to beginning of BKPyV-HC. Although CMV serostatus was included in the final model, detection of CMV viremia was not significantly associated with resolution of macroscopic hematuria (supplemental Table 1A). ^bMultivariable model is adjusted for duration of cystitis symptoms prior to beginning of BKPyV-HC. ^cMultivariable model is adjusted for duration of cystitis symptoms prior to beginning of BKPyV-HC, HLA match, and diagnosis of chronic GVHD.