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dc.contributor.authorRich, A.
dc.contributor.authorBrandes, K.
dc.contributor.authorMullan, Barbara
dc.contributor.authorHagger, Martin
dc.identifier.citationRich, A. and Brandes, K. and Mullan, B. and Hagger, M. 2015. Theory of planned behavior and adherence in chronic illness: a meta-analysis. Journal of Behavioral Medicine. 38 (4): pp. 673-688.

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.

dc.publisherSpringer New York LLC
dc.titleTheory of planned behavior and adherence in chronic illness: a meta-analysis
dc.typeJournal Article
dcterms.source.titleJournal of Behavioral Medicine

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curtin.departmentSchool of Psychology and Speech Pathology
curtin.accessStatusOpen access

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