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Testing an extended theory of planned behavior to predict young people's intentions to join a bone marrow donor registry


Correspondence concerning this article should be addressed to Melissa K. Hyde, Griffith Health Institute, Griffith University, 176 Messines Ridge Road, Mt Gravatt, Queensland 4122. E-mail:


An extended theory of planned behavior (TPB) was used to understand the factors, particularly control perceptions and affective reactions, given conflicting findings in previous research, informing younger people's intentions to join a bone marrow registry. Participants (N = 174) completed attitude, subjective norm, perceived behavioral control (PBC), moral norm, anticipated regret, self-identity, and intention items for registering. The extended TPB (except PBC) explained 67.2% of variance in intention. Further testing is needed as to the volitional nature of registering. Moral norm, anticipated regret, and self-identity are likely intervention targets for increasing younger people's bone marrow registry participation.