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Construct validity of a mammography processes of change scale and invariance by stage of change
Sandi L Pruitt1, Amy McQueen, Jasmin A Tiro
1Division of Health Behavior Research, Washington University School of Medicine, St Louis, MO 63108, USA. spruitt@dom.wustl.edu
Abstract:
The development and use of validated processes of change (POC) measures have received little attention in the literature despite their importance in the Transtheoretical Model. Using survey data (N = 2909), we examined the construct validity of a 22-item mammography POC scale by testing for factorial validity and factorial invariance across stage of change. We also used MANOVA with Tukey post-hoc tests to confirm stage differences in POC use (concurrent validity). Our results confirm the a priori correlated four-factor structure of this scale and provide some support for the measurement equivalence of this scale across stage, supporting comparisons of POC use across stage.
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