title: Using an Extended Theory of Planned Behavior to Predict a Change in the Type of Blood Product Donated.
abstract: BACKGROUND
  Demand for essential plasma-derived products is increasing.
  
  
  OBJECTIVE
  This prospective study aims to identify predictors of voluntary non-remunerated whole blood (WB) donors becoming plasmapheresis donors.
  
  
  METHODS
  Surveys were sent to WB donors who had recently (recent n = 1,957) and not recently donated (distant n = 1,012). Theory of Planned Behavior (TPB) constructs (attitude, subjective norm, self-efficacy) were extended with moral norm, anticipatory regret, and donor identity. Intentions and objective plasmapheresis donation for 527 recent and 166 distant participants were assessed.
  
  
  RESULTS
  Multi-group analysis revealed that the model was a good fit. Moral norm and self-efficacy were positively associated while role identity (suppressed by moral norm) was negatively associated with plasmapheresis intentions.
  
  
  CONCLUSIONS
  The extended TPB was useful in identifying factors that facilitate conversion from WB to plasmapheresis donation. A superordinate donor identity may be synonymous with WB donation and, for donors with a strong moral norm for plasmapheresis, may inhibit conversion.
authors.affiliation: Public Health, The Florey Institute of Neurosciences and Mental Health, 245 Burgundy Street, Heidelberg, VIC, 3084, Australia, kathleen.bagot@florey.edu.au.
authors.forename: Kathleen L
authors.initials: KL
authors.lastname: Bagot
authors.forename: Barbara M
authors.initials: BM
authors.lastname: Masser
authors.forename: Katherine M
authors.initials: KM
authors.lastname: White
mesh_terms: D000328:Adult; D001290:Attitude; D001782:Blood Donors / Q000523:psychology*; D005260:Female; D006801:Humans; D033182:Intention; D008297:Male; D008960:Models, Psychological; D020377:Self Efficacy; D055815:Young Adult