title: Predicting intentions and behaviours in populations with or at-risk of diabetes: A systematic review.
abstract: OBJECTIVE
  To systematically review the Theory of Planned Behaviour studies predicting self-care intentions and behaviours in populations with and at-risk of diabetes.
  
  
  METHODS
  A systematic review using six electronic databases was conducted in 2013. A standardised protocol was used for appraisal. Studies eligibility included a measure of behaviour for healthy eating, physical activity, glucose monitoring, medication use (ii) the TPB variables (iii) the TPB tested in populations with diabetes or at-risk.
  
  
  RESULTS
  Sixteen studies were appraised for testing the utility of the TPB. Studies included cross-sectional (n = 7); prospective (n = 5) and randomised control trials (n = 4). Intention (18%-76%) was the most predictive construct for all behaviours. Explained variance for intentions was similar across cross-sectional (28-76%); prospective (28-73%); and RCT studies (18-63%). RCTs (18-43%) provided slightly stronger evidence for predicting behaviour.
  
  
  CONCLUSIONS
  Few studies tested predictability of the TPB in populations with or at-risk of diabetes. This review highlighted differences in the predictive utility of the TPB suggesting that the model is behaviour and population specific. Findings on key determinants of specific behaviours contribute to a better understanding of mechanisms of behaviour change and are useful in designing targeted behavioural interventions for different diabetes populations.
authors: Institute of Health and Biomedical Innovation (IHBI), Queensland University of Technology, Brisbane, Australia.
authors: Heena
authors: H
authors: Akbar
authors: Institute of Health and Biomedical Innovation (IHBI), Queensland University of Technology, Brisbane, Australia.
authors: Debra
authors: D
authors: Anderson
authors: School of Exercises and Nutrition Sciences, Faculty of Health, Queensland University of Technology, Brisbane, Australia.
authors: Danielle
authors: D
authors: Gallegos
keywords: Diabetes management; Predicting diabetes behaviour; Theory of planned behaviour