Health messages to promote fruit and vegetable consumption at different stages : A match-mismatch design
Godinho, Cristina, Alvarez, Maria-Joao, Lima, Maria and Schwarzer, Ralf. (2015). Health messages to promote fruit and vegetable consumption at different stages : A match-mismatch design. Psychology and Health. 30(12), pp. 1410-1432. https://doi.org/10.1080/08870446.2015.1054827
|Authors||Godinho, Cristina, Alvarez, Maria-Joao, Lima, Maria and Schwarzer, Ralf|
Objective: To examine the effectiveness of matching health messages promoting fruit and vegetable intake to the Health Action Process Approach stages of change.
Design: In a randomised controlled trial, 205 undergraduate students (non-intenders n = 123; intenders n = 82) were exposed to one of three health messages, targeted at non-intenders, intenders and controls.
Main outcome measures: Three longitudinal assessments of stage, fruit and vegetable intake, and social-cognitive determinants were obtained.
Results: Stage-specific effects of the interventions were confirmed. For self-efficacy, a stage by health message crossover interaction emerged, with both non-intenders and intenders in the matched conditions scoring higher in self-efficacy. Furthermore, in line with predictions, non-intenders in the matched condition showed higher risk perception, outcome expectancies, intention, and stage progression immediately after message exposure, and lower levels of action planning and coping planning a week later in the mismatched condition, but for these outcomes no differences across conditions were obtained among intenders. Multiple mediation analyses confirmed the facilitating role of self-efficacy and behavioural intention among non-intenders.
Conclusions: Stages should be considered when designing health messages, although more interactive interventions for intenders and extended measurement time frames may be required.
|Keywords||fruit and vegetable intake; health message targeting; stages of change; randomised controlled trial; multiple mediation analyses|
|Journal||Psychology and Health|
|Journal citation||30 (12), pp. 1410-1432|
|Digital Object Identifier (DOI)||https://doi.org/10.1080/08870446.2015.1054827|
|Open access||Published as green open access|
|Funder||National Foundation for Science and Technology, Portugal|
|Research Group||Institute for Positive Psychology and Education|
|Author's accepted manuscript|
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|Online||24 Jul 2015|
|Publication process dates|
|Accepted||26 May 2015|
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