What influences communication about retention in randomised trials : a multi-trial, theory-based analysis exploring trial staff perspectives

Acknowledgements The authors would like to thank Rumana Newlands (RN) for her work in conducting the first set of interviews and support in accessing that data. We would also like to thank Louisa Lawrie for helping to provide training to TC in the analysis of TDF interviews. Funding TC held a PhD linked to the Trials Methodology Research Partnership funded by the Medical Research Council UK and National Institute for Health research (MR/S014357/1). The study that generated data for interview set two was supported by the Chief Scientist Office of the Scottish Government Health and Social Care Directorates (Grant number CZU/3/3). The Health Services Research Unit, Institute of Applied Health Sciences (University of Aberdeen), is core-funded by the Chief Scientist Office of the Scottish Government Health and Social Care Directorates. They were not involved in the design of the study or the collection, analysis, and interpretation of data.Peer reviewedPublisher PD