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Randomised controlled trial.
Participants were recruited through newspaper and radio advertisements. 762 participants completed the baseline questionnaire. Follow up was 85% (n=646, mean age 44 y, 82% women).
Participants were allocated to 1 of 3 groups, which differed by the type of nutrition information they received: a computer generated feedback letter individualised to the participant's dietary behaviour for fat, fruit, and vegetable intake and a second iterative feedback letter tailored to changes in dietary behaviour made after the first feedback letter (group 1, n=215); a computer generated feedback letter, which …
Source of funding: The Dutch Cancer Society.
For correspondence: Dr J Brug, Department of Social Studies, Open University, PO Box 2960, 6401 DL Heerlen, the Netherlands. Fax +31 45 5762939.