RT Journal Article SR Electronic T1 Conducting randomised controlled trials in primary care: lessons from an obesity management trial JF British Journal of General Practice JO Br J Gen Pract FD British Journal of General Practice SP 674 OP 679 VO 56 IS 530 A1 Pauline Nelson A1 Ashley Adamson A1 Helen Moore YR 2006 UL http://bjgp.org/content/56/530/674.abstract AB Background A UK trial ending in 2002 reported that a training intervention to improve the management of obesity in primary care had no impact. Process analysis showed that the intervention was taken up by very few of the practitioners in the participating practices.Aim The aim of the current study was to explore both the reasons behind low levels of implementation and the context in which the trial was delivered.Design In-depth qualitative interviews.Setting General practices in the North East of England.Method Interviews with 13 practitioners (GPs and practice nurses) and 10 patients, representing seven of the eight intervention practices in the largest centre of the original trial.Results While patients were clear that they had participated in a trial few of those interviewed had any recollection of the intervention. Most staff were positive about the training, resources to use with patients and the weight management model, but not all training needs were met. High initial expectations of the trial gave way to disillusionment, exacerbated by significant misunderstanding by some practice staff of their role in implementation.Conclusions Frustration among practitioners managing obesity in primary care combined with unrealistic expectations of and misunderstanding about an intervention designed to improve care in the field, appeared to have resulted in disillusionment with and consequent disengagement from the trial.