Past behavior and its moderating effects on self-identity-intention relationships

The self-identity and past behavior measures were included in a structured TPB (Theory of Planned Behavior) questionnaire, with the major aim of providing support for the hypothesized main and interaction effects. Results supported the validity of the TPB model, with subjective norm as the strongest predictor of intention. In addition, self-identity (β = .10, p < .049), and past behavior (β = .25, p < .001) emerged as significant predictors of intention in the augmented model. Moreover, a moderation effect was observed for past behavior on self-identity-intention relations (β = -.15, p < .001), the significance of which was confirmed by simple slope analysis.