Journal:Archives of Physical Medicine and Rehabilitation
Year, Volume, Issue, Page(s):13, 94, 3, 579-588
Study identified the best-fitting descriptive models for a set of commonly adopted outcome measures found within the Traumatic Brain Injury Model Systems (TBIMS) National Database. The TBIMS is a multicenter, longitudinal study of traumatic brain injury (TBI) funded by the National Institute on Disability and Rehabilitation Research. Results indicated that the negative exponential was the best fit for 3 of the 7 outcomes: the Functional Independence Measure (FIM) Motor scale, the FIM Cognitive scale, and the Disability Rating Scale). The Satisfaction With Life Scale was best modeled by a quadratic trend, while the Supervision Rating Scale, the Glasgow Outcome Scale-Extended, and weeks of employment per year were best modeled by cubic trends. The statistical methods described may be used to assist researchers and clinicians in (1) modeling the outcome measures considered, (2) modeling various portions of these outcomes by stratification and/or truncating time periods, (3) modeling longitudinal outcome measures not considered, and (4) establishing models as a necessary precursor in conducting individual growth curve analysis.