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01-08-2015 | Uitgave 4/2015

Journal of Behavioral Medicine 4/2015

Theory of planned behavior and adherence in chronic illness: a meta-analysis

Tijdschrift:
Journal of Behavioral Medicine > Uitgave 4/2015
Auteurs:
Antonia Rich, Kim Brandes, Barbara Mullan, Martin S. Hagger
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Electronic supplementary material

The online version of this article (doi:10.​1007/​s10865-015-9644-3) contains supplementary material, which is available to authorized users.

Abstract

Social-cognitive models such as the theory of planned behavior have demonstrated efficacy in predicting behavior, but few studies have examined the theory as a predictor of treatment adherence in chronic illness. We tested the efficacy of the theory for predicting adherence to treatment in chronic illness across multiple studies. A database search identified 27 studies, meeting inclusion criteria. Averaged intercorrelations among theory variables were computed corrected for sampling error using random-effects meta-analysis. Path-analysis using the meta-analytically derived correlations was used to test theory hypotheses and effects of moderators. The theory explained 33 and 9 % of the variance in intention and adherence behavior respectively. Theoretically consistent patterns of effects among the attitude, subjective norm, perceived behavioral control, intention and behavior constructs were found with small-to-medium effect sizes. Effect sizes were invariant across behavior and measurement type. Although results support theory predictions, effect sizes were small, particularly for the intention-behavior relationship.

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Extra materiaal
Supplementary material 1 (DOCX 46 kb)
10865_2015_9644_MOESM1_ESM.docx
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