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Theory of Planned Behavior

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.

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Theory of Planned Behavior

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  1. Theory of Planned Behavior Article Review Evan Hilberg

  2. 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.

  3. 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-

  4. 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

  5. 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”

  6. 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

  7. 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

  8. 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

  9. 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

  10. Plotnikoff et al’s test of TPB

  11. 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

  12. 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

  13. Discussion • Mediation assumptions were satisfied for the constructs, although they were small

  14. Class discussion • What does it all mean?? • Implications of overall variances • Implications of mediation and moderation • Implications of gender differences

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