Using an extended theory of planned behaviour to predict intention towards organ donation

The aim of this study was to test an extended Theory of Planned Behaviour (TPB) as utilised by Armitage and Conner (2001) to predict intention towards organ donation upon death. A second aim of this study was to provide evidence for the distinction between Perceived behavioural control (PBC) and Self-efficacy (SE) in the TPB. Of the 91 university students surveyed (M=24.09, SD=8.55), 84 students reported no medical reason that would prevent them from donating organs. A hierarchical regression (Attitude (Att) and Subjective norm (SN) [Step 1], SE and PBC [Step 2], and Self-identity (SI) and Moral norm (MN) [Step 3]) to predict intention towards organ donation was found to account for 76% of the unique variance. Only Att and SE were found to be significant predictors in the final model. R2 change indicated that Step 3 did not account for a significant amount of variance. Findings in relation to the study's aims are discussed