Objective:
Functional impairment from recurrent joint bleeding in people with hemophilia results in joint pain and reduces quality of life. The P-FiQ study formally evaluated patient- and site-reported functional assessment including responses to generic and hemophilia-specific patient-reported outcomes (PROs) tools. Psychometric analyses were used to evaluate reliability, validity, and consistency of responses.
Methods:
Adult males with hemophilia and a history of joint pain or bleeding completed a hemophilia history and 5 PROs assessing function: EQ-5D-5L, Brief Pain Inventory v2 Short Form (BPI), International Physical Activity Questionnaire (IPAQ), Short Form-36 v2 (SF-36v2), and Hemophilia Activities List (HAL). PROs were assessed for reliability, consistency, and correlation, with factors including patient-reported characteristics.
Summary:
A total of 381 adults (median age, 34 years; range, 18-86 years) were enrolled in P-FiQ. Most participants (66%) and sites (59%) reported functional disability in the past 6 months (CDC-UDC scale). Patients self-reported arthritis/bone/joint problems (65%) and history of joint procedures or surgeries (50%). On EQ-5D-5L, most reported problems “today” with mobility (61%) and usual activities (53%) but fewer with self-care (19%). On BPI, similar median pain interference scores (0- 10 scale, 10 is complete interference) were reported with general activity (3.0), walking ability (3.0), and normal work (3.0). On IPAQ, physical activity was reported by 49% of respondents over the prior week, with more reporting walking (35%) than moderate (16%) or vigorous (16%) activities. On SF-36v2, activities in the past 4 weeks that were most frequently limited were vigorous activities (80%), bending, kneeling, or stooping (67%), walking more than a mile (61%), and climbing several flights of stairs (59%). Physical problems caused participants to limit kinds of work/activities (69%), accomplish less than they would like (66%), have difficulty in performing work/activities (65%), and reduce time spent on work/activities (62%). On HAL, greater difficulties were seen for lower vs upper extremity functions/activities; within the lying/sitting/kneeling/standing domain, the most frequent problems in the previous month were squatting for a long time (74%), kneeling (73%) or standing (72%), and kneeling/squatting (70%). Similar items across different PROs were correlated with one another. Self- reported functional impairment was significantly differentiated by BPI pain interference, IPAQ total activity, SF-36v2 physical functioning, and all HAL domains and summary scores.
Conclusion:
PRO instruments assessing functional status range from simple/generic (EQ-5D-5L) to complex/disease-specific (HAL) and provide varying levels of detail. Greater use of formal PRO instruments in the clinical setting may improve dialogue between health care professionals and patients/caregivers and inform proactive approaches to specifically target patient identified functional limitations (eg, HAL) and identify areas for further targeted management strategies.