Patient disposition.^aDid not discontinue from the study prematurely. Patients who discontinued participation in the study because the study was stopped were considered to have completed the study. ^bPatients were discontinued because of central laboratory results indicating baseline FIX activity level >2%. ^cPatient was discontinued because of site closing. ^dPatient was withdrawn from the study because of treatment-emergent serious adverse event (TESAE) of hypersensitivity and FIX inhibition, which were considered related to study treatment.