Journal:Journal of Head Trauma Rehabilitation
Year, Volume, Issue, Page(s):16, 31, 1, 40-51
Article describes the development and calibration of the Traumatic Brain Injury Quality-of-Life (TBI-QOL), a comprehensive patient-reported outcomes (PRO) measurement system specifically for individuals with traumatic brain injury (TBI). The TBI-QOL was developed in 2 distinct phases. The initial phase focused on development of the domain structure, evaluation of extant items, and creation and refinement of new item pools. Qualitative input was obtained from individuals with TBI, TBI clinicians, and caregivers of individuals with TBI through multiple methods, including focus groups, individual interviews, patient consultation, and cognitive debriefing interviews. The TBI-QOL preliminary subdomains and items consisted of 28 item pools across 4 larger domains of physical, emotional, cognitive, and social health. The second phase focused on large-scale field testing, item calibration, finalization of item banks, and creation of computer adaptive tests (CATs) and short forms. Item pools were field tested in a sample of 675 individuals with TBI recruited from 5 TBI Model Systems centers across the United States and calibrated using item response theory methods. Twenty calibrated item banks, 2 brief, fixed-length scales, and 6 uncalibrated item pools were developed. Once all analyses were completed and all parameters transformed, CATs and static short forms were developed for each item bank. The final TBI-QOL consists of 20 independent calibrated item banks and 2 uncalibrated scales that measure physical, emotional, cognitive, and social aspects of health-related quality of life.