Short Tilte:Systematic bias in traumatic brain injury outcome studies because of loss to follow-up
Journal:Archives of Physical Medicine and Rehabilitation
Year, Volume, Issue, Page(s):03, 84, 2, 153-160
Article describes some of the sources of systematic bias created by subjects lost to follow-up in long-term traumatic brain injury (TBI) outcome studies. Longitudinal data sets were used to compare characteristics for subjects lost and found for 1- and 2-year follow-ups. Three major risk categories identified included individuals with: (1) lower socioeconomic status, (2) a history of substance abuse, and (3) injury because of violence.