“…Outcome studies have shown that factors such as age (Hoofien, Vakil, Gilboa, Donovick, & Barak, 2002) and injury severity, as measured by posttraumatic amnesia (PTA) duration and Glasgow Coma Scale (GCS) scores, are relatively strong predictors of outcome, but account for less than 30 percent of the variance in outcomes (Ponsford, Olver, Curran, & Ng, 1995). Other studies have demonstrated that coping style, social factors (Moore & Stambrook, 1992;Moore, Stambrook, & Wilson, 1991;Snead & Davis, 2002) and motivation for and participation in rehabilitation (Cavallo & Saucedo, 1995;Gallaher & Hough, 2001;Wallace & Bogner, 2000) may also influence outcome. These factors may be influenced, in turn, by illness beliefs and cultural background.…”