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Health Education Research Advance Access published online on October 13, 2006
Health Education Research, doi:10.1093/her/cyl121
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© The Author 2006. Published by Oxford University Press. All rights reserved. For permissions, please email: journals.permissions@oxfordjournals.org
Received October 17, 2005
Accepted August 24, 2006

Original article

Comparing stage of change and behavioral intention to understand fruit intake

Emely de Vet 1 *, Jascha de Nooijer 2, Nanne K. de Vries 2, and Johannes Brug 3

1 Department of Public Health, Erasmus MC University Medical Center, Rotterdam, The Netherlands; Department of Health Education and Promotion, Universiteit Maastricht, Maastricht, The Netherlands
2 Department of Health Education and Promotion, Universiteit Maastricht, Maastricht, The Netherlands
3 Department of Public Health, Erasmus MC University Medical Center, Rotterdam, The Netherlands

* To whom correspondence should be addressed.
Emely de Vet, E-mail: emely.de.vet{at}falw.vu.nl


  Abstract

We explored if the pre-action Transtheoretical stages of change are indeed discrete stages for fruit intakes. In a longitudinal design, a cohort of 735 adults completed electronic questionnaires assessing fruit intake, stages of change and intention to increase fruit intake at baseline and 35 and 67 days follow-up. A dichotomization of a continuous intention measure (‘pseudostages’) was compared with precontemplation and contemplation stages. The results showed (i) that pseudostages and stages of change were strongly associated; (ii) that for most respondents, stability and transitions in stages of change resembled transitions in pseudostage, while test-retest reliabilities for both measures were similar and (iii) that pseudostages and the continuous intention measure were stronger predictors of fruit intake than stage of change. We conclude that pre-action stages of change for fruit are not different from a mere categorization of a continuous intention measure.


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