A Principal Component Analysis of the Katz Adjustment Scale in a Traumatic Brain Injury Rehabilitation Sample

ABSTRACT The KAS-R1 was completed by relatives of 88 clients who had enrolled in a post-acute rehabilitation program for the treatment of traumatic brain injury. The items were subjected to a principal component analysis. The analysis yielded 10 statistically significant component groups. Internal consistency as determined by Cronbach alpha ranged from .78 to .94. Moderate correlations were observed between a number of component groups suggesting some overlap in components derived. The results suggest that the 127 items of the KAS-R1 form component groups which may represent categorically differentiated behavioral symptoms. Future research is needed to discern the extent to which the component groups describe behavioral phenomena.