title: Validation of the TTM processes of change measure for physical activity in an adult French sample.
abstract: BACKGROUND
  Processes of change (POC) are constructs from the transtheoretical model that propose to examine how people engage in a behavior. However, there is no consensus about a leading model explaining POC and there is no validated French POC scale in physical activity
  
  
  OBJECTIVE
  This study aimed to compare the different existing models to validate a French POC scale.
  
  
  METHODS
  Three studies, with 748 subjects included, were carried out to translate the items and evaluate their clarity (study 1, n = 77), to assess the factorial validity (n = 200) and invariance/equivalence (study 2, n = 471), and to analyze the concurrent validity by stage × process analyses (study 3, n = 671).
  
  
  RESULTS
  Two models displayed adequate fit to the data; however, based on the Akaike information criterion, the fully correlated five-factor model appeared as the most appropriate to measure POC in physical activity. The invariance/equivalence was also confirmed across genders and student status. Four of the five existing factors discriminated pre-action and post-action stages.
  
  
  CONCLUSIONS
  These data support the validation of the POC questionnaire in physical activity among a French sample. More research is needed to explore the longitudinal properties of this scale.
authors: Laboratory Epsylon EA 4556, Dynamics of Human Abilities and Health Behaviors, University of Montpellier 1, 700 Avenue du Pic Saint-Loup, 34090, Montpellier, France, paquito.bernard@univ-montp1.fr.
authors: Paquito
authors: P
authors: Bernard
authors: Ahmed-Jérôme
authors: AJ
authors: Romain
authors: Raphael
authors: R
authors: Trouillet
authors: Christophe
authors: C
authors: Gernigon
authors: Claudio
authors: C
authors: Nigg
authors: Gregory
authors: G
authors: Ninot
mesh_terms: D000328:Adult; D000704:Analysis of Variance; D015444:Exercise / Q000523:psychology*; D005260:Female; D005602:France; D006801:Humans; D008297:Male; D008960:Models, Psychological; D009043:Motor Activity; D015203:Reproducibility of Results; D012107:Research Design; D011795:Surveys and Questionnaires; D014177:Translations; D055815:Young Adult
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