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Health Education Research Advance Access published online on November 9, 2004
Health Education Research, doi:10.1093/her/cyg131
© 2004 by Oxford University Press
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Received May 5, 2004
Accepted September 7, 2004

Original article

Stages of change for physical activity in a community sample of adolescents

Ilse De Bourdeaudhuij 1*, Renaat Philippaerts 1, Geert Crombez 2, Lynn Matton 3, Katrien Wijndaele 1, Anne-Line Balduck 1, and Johan Lefevre 3

1 Department of Movement and Sport Sciences, Ghent University, 9000 Ghent, Belgium
2 Department of Experimental Clinical and Health Psychology, Ghent University, 9000 Ghent, Belgium
3 Department of Sports and Movement Sciences, KU Leuven, 3001 Leuven, Belgium

* To whom correspondence should be addressed.
Ilse De Bourdeaudhuij, E-mail: Ilse.Debourdeaudhuij{at}UGent.be


  Abstract

The aims of the present study were to investigate (1) the proportion of adolescents in each of the stages of change, (2) the differences in psychosocial factors and in physical activity between the stages, and (3) the classification accuracy using several reference criteria. A random sample of 38 schools from the Flemish community in Belgium resulted in a sample of 5931 adolescents (mean age = 14.8, range 12-18, 61% females). All adolescents completed a computerized questionnaire assessing demographic variables, physical activity, physical activity determinants and stages of change. Distribution across the stages was: precontemplation, n = 684 (11.5%); contemplation, n = 948 (16.0%); preparation, n = 818 (13.8%); action, n = 492 (8.3%); and maintenance, n = 2989 (50.4%). Analyses revealed gender and age differences (P < 0.001), with girls and older adolescents being more prevalent in the first three stages. Differences between the stages of change were related to higher levels of physical activity of different intensity and within different contexts (P < 0.001), together with more favorable psychosocial determinants related to physical activity (P < 0.001). No differences between stages were found for sedentary activities. Three subgroups of adolescents were identified based on psychosocial determinants and physical activity levels. About 71% of the adolescents placed themselves in a stage which was in accordance with their self-reported level of physical activity.


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