Practical help for specifying the target difference in sample size calculations for RCTs: The DELTA² five-stage study, including a workshop

Jonathan A. Cook^*, Steven A. Julious, William Sones, Lisa V. Hampson, Catherine Hewitt, Jesse A. Berlin, Deborah Ashby, Richard Emsley, Dean A. Fergusson, Stephen J. Walters, Edward C.F. Wilson, Graeme Maclennan, Nigel Stallard, Joanne C. Rothwell, Martin Bland, Louise Brown, Craig R. Ramsay, Andrew Cook, David Armstrong, Douglas AltmanLuke D. ValeShow 1 moreShow less