We developed a unidimensional measure of participation by rescoring the Participation Assessment with Recombined Tools-Objective (PART-O).
A total of 9911 PART-O assessments in the Traumatic Brain Injury Model Systems National Database were analyzed.
Rasch analysis used summated items to address competing personal preferences.
A unidimensional, psychometrically sound measure of participation resulted.
Item scaling was consistent across time from 1 to 25 years postinjury.