title: Construct validity of a mammography processes of change scale and invariance by stage of change.
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.
authors.affiliation: Division of Health Behavior Research, Washington University School of Medicine, St Louis, MO 63108, USA. spruitt@dom.wustl.edu
authors.forename: Sandi L
authors.initials: SL
authors.lastname: Pruitt
authors.forename: Amy
authors.initials: A
authors.lastname: McQueen
authors.forename: Jasmin A
authors.initials: JA
authors.lastname: Tiro
authors.forename: William
authors.initials: W
authors.lastname: Rakowski
authors.forename: Carlo C
authors.initials: CC
authors.lastname: Diclemente
authors.forename: Sally W
authors.initials: SW
authors.lastname: Vernon
mesh_terms: D005260:Female; D006801:Humans; D008327:Mammography / Q000379:methods*; D008875:Middle Aged; D015203:Reproducibility of Results; D011795:Surveys and Questionnaires; D013997:Time Factors