title: A prospective evaluation of the Transtheoretical Model of Change applied to exercise in young people.
abstract: OBJECTIVE
  To investigate the utility of the Transtheoretical Model of Change in predicting exercise in young people.
  
  
  METHODS
  A prospective study: assessments were done at baseline and follow-up 6 months later.
  
  
  METHODS
  Using stratified random sampling 1055 Chinese high school pupils living in Hong Kong, 533 of who were followed up at 6 months, completed measures of stage of change (SCQ), self-efficacy (SEQ), perceptions of the pros and cons of exercising (DBQ) and processes of change (PCQ). Data were analysed using one-way ANOVA, repeated measures ANOVA and independent sample t tests.
  
  
  RESULTS
  The utility of the TTM to predict exercise in this population is not strong; increases in self-efficacy and decisional balance discriminated between those remaining active at baseline and follow-up, but not in changing from an inactive (e.g., Precontemplation or Contemplation) to an active state (e.g., Maintenance) as one would anticipate given the staging algorithm of the TTM.
  
  
  CONCLUSIONS
  The TTM is a modest predictor of future stage of change for exercise in young Chinese people. Where there is evidence that TTM variables may shape movement over time, self-efficacy, pros and behavioural processes of change appear to be the strongest predictors.
authors: University of Nottingham, School of Nursing, Midwifery and Physiotherapy, Porchester Road, Nottingham NG3 6AA, UK. Patrick.Callaghan@nottingham.ac.uk
authors: Patrick
authors: P
authors: Callaghan
authors: Elizabeth
authors: E
authors: Khalil
authors: Ioannis
authors: I
authors: Morres
mesh_terms: D000293:Adolescent; D000704:Analysis of Variance; D001521:Behavior Therapy; D015444:Exercise; D006801:Humans; D008962:Models, Theoretical; D011446:Prospective Studies; D020377:Self Efficacy