Of 52 patients enrolled in the study, 39 completed the daily diaries (23 adult diaries, 16 caregiver-reported diaries) and 37 completed daily QOL assessments (19 adult patients, 18 caregivers on behalf of patients). Baseline demographics and patient characteristics for enrolled and QOL populations are shown in Table 1. Demographics of patients who completed the QOL assessments did not differ statistically from those of patients who did not complete the diary or QOL assessments in any measured characteristics. Approximately half of all enrolled and QOL patients were older than 18 years. The majority of enrolled/QOL patients were white (71.2%/ 73.0%) and non-Hispanic (65.4%/73.0%). Overall, about half had central venous access devices, and this was more commonly seen in children and adolescents. Slightly less than half had concomitant chronic illnesses, the most common of those being hepatitis C. Most patients were limited in recreational activities, work/school, and/or self-care activities; only one quarter reported “unrestricted” functional status. The median (range) number of historical bleeds over the prior 1 year was 13 (2–50), and the median duration of study participation was 91 days. Of the 39 patients who completed a diary, 38 reported 194 bleeding episodes and 1 had no bleeds during the diary completion period and was therefore not included in the bleeding and QOL analyses. The allocation of patients, number and frequency of bleeding episodes, and percentage of bleed days within the three treatment groups and within the adult/pediatric diaries are shown in Table 2.