|Title||A Comparison of Two Measures of Physical Activity Among Adults with Physical Disabilities: The Issue of Scale Correspondence|
|Publication Type||Journal Article|
|Year of Publication||2009|
|Authors||Ellis, R, kosma, M, Cardinal, BJ, Bauer, JJ, McCubbin, JA|
|Journal||Journal of Developmental and Physical Disabilities|
|Pagination||393 - 407|
The purpose of the study was to examine the issue of scale correspondence by testing the theory of planned behavior (TPB) using two models. Participants were 223 adults (M age=45.4 years, SD=10.8) with self-reported physical disabilities who completed an on-line survey. Using a cross-sectional design, participants completed demographic questions, TPB items, and two measures of physical activity. Path analyses, using one model that included a measure of behavior developed according to the TPB recommendations and a second model that used the Physical Activity Scale for Individuals with Physical Disabilities (PASIPD) generally supported the hypotheses of the TPB. Further, the model with the TPB scale (R2=.66) accounted for more variance in physical activity than the model using the PASIPD (R2=.15). Our findings are consistent with previous research; however, we argue that scale correspondence may not be statistically or philosophically appropriate.