theory of planned behavior
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Theory of Planned Behavior. Article Review Evan Hilberg. Article Review. A Test of the Theory of Planned Behavior to Explain Physical Activity in a Large Population Sample of Adolescents from Alberta, Canada Journal of Adolescent Health, 2011 Plotnikoff , Lubans , Costigan , et.al. - PowerPoint PPT PresentationTRANSCRIPT
Theory of Planned Behavior
ARTICLE REVIEW
EVAN HILBERG
Article Review A Test of the Theory of Planned Behavior to Explain Physical Activity in a Large Population Sample of Adolescents from Alberta, Canada
Journal of Adolescent Health, 2011
Plotnikoff, Lubans, Costigan, et.al.
Theory of Planned Behavior Social-cognitive theory used to explain PA behaviors
A person’s intention to perform a behavior is the central determinant
Intention determined by attitude, social norms, and perceived control
Attitude-
Norms-
Perceived control-
Introduction/Purpose TBP hasn’t been tested extensively in adolescent populations
Primary objective-◦ Explore the power of TBP to explain PA behaviors in adolescents
Alternative objectives-◦ Explore moderating effects of gender◦ Explore mediating effects of intention
Methodology Validated, short measures of TBP constructs (att, norms, intent)
Attitude- 2 item construct (enjoyment and importance)
Subjective Norms- “Most people important to me think I should take part in regular PA”
Methodology
Intention- “I plan to be physically active on a regular basis over the next month”
Perceived behavior control- 4 item self-efficacy measure
Validated PAQ for Older Children used to assess PA levels over 7 days
Methodology Series of models used to test secondary objectives
◦ Gender was ID as a potential moderator◦ Unrestricted to fully constrained models◦ Intention seen as mediator
Analysis of moment structures used to test primary objective◦ Adjusted for school
Results Sample reflects overall Alberta population
The model testing revealed an excellent fit to the data◦ All pathways significant◦ Model explained 59% and 43% (intention/behavior)
Mediation analyses◦ Intention found to mediate relationship between variables and PA◦ All pathways were significant
Results Moderation analyses revealed excellent fit to the data
◦ Both boys and girls◦ Further analyses showed stronger relationship among boys in model◦ Also showed stronger relationship among boys among pathways
Plotnikoff et al’s test of TPB
Discussion Largest TPB study in youth with a representative sample
Results support the TPB with significance for all construct pathways
Perceived control and intention accounted for 43% of variance of behavior
Attitude, norms, and perceived control explained 59% of the variance for intention
Discussion Results are consistent with other literature in adult and adolescent populations
Differences existed between genders in the models
Perceived control was strongest correlate of behavior for all
Attitude was strongest correlate of intention for all
Discussion Mediation assumptions were satisfied for the constructs, although they were small
Class discussion What does it all mean??
Implications of overall variances
Implications of mediation and moderation
Implications of gender differences