Intention stability assessed using residual change scores moderates the intention-behaviour association: a prospective cohort study

Alicia A. Rowan, Máirtín S. McDermott, Mark S. Allen

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

Abstract

Intention stability is considered to be one of the key pre-requisites for a strong association between intention and behaviour. It has been claimed, however, that studies examining the moderating impact of intention stability may be invalid, as they have relied on statistically inferior methods. Residual change scores have been suggested as a more appropriate method of measuring change (or lack thereof) in constructs. The aim of the current study, therefore, is to test whether intention stability, calculated using residual change scores, moderates the intention-physical activity behaviour association. A total of 163 participants (124 women, 39 men) completed questionnaires online at three time points separated by 14 day intervals. The moderating impact of intention stability was assessed using multiple linear regression followed up using simple slope analyses to identify the direction of any effect. The interaction of intention and intention stability was found to significantly improve the overall model fit. Intentions had a stronger positive association with behaviour when intentions were more stable than when they were more unstable. However, sensitivity analyses revealed that the association was not robust and reduced to non-significant with the removal of potential multivariate outliers. Future research should use residual change scores as the preferred method of assessing intention stability.

Original languageEnglish
Pages (from-to)1256-1261
Number of pages6
JournalPsychology, Health and Medicine
Volume22
Issue number10
DOIs
Publication statusPublished - 12 May 2017
Externally publishedYes

Keywords

  • intention stability
  • physical activity
  • prospective cohort study
  • Theory of planned behaviour

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