French, David PMiles, Lisa M.Elbourne, Diana R.Farmer, Andrew J.Gulliford, Martin C.Locock, LouiseSutton, StephenMcCambridge, JimMERIT Collaborative group2021-09-232021-09-232021-11-30French, D P, Miles, L M, Elbourne, D R, Farmer, A J, Gulliford, M C, Locock, L, Sutton, S, McCambridge, J & MERIT Collaborative group 2021, 'Reducing bias in trials due to reactions to measurement : experts produced recommendations informed by evidence  ', Journal of Clinical Epidemiology, vol. 139, pp. 130-139. https://doi.org/10.1016/j.jclinepi.2021.06.0280895-4356ORCID: /0000-0002-8109-1930/work/96652745SCOPUS: 85113615552https://hdl.handle.net/2164/17138ACKNOWLEDGEMENTS The authors would like to acknowledge the expert input provided into the scope of these recommendations from participants in an international Delphi procedure. The following people took part in the Delphi procedure and participants had a range of views. Participation in the Delphi procedure does not necessarily mean agreement with the recommendations FUNDING The MERIT study was funded by the MRC/NIHR Methodology Research Programme (reference MC_PC_17229); funders have had no role in the design of the study or the writing of this manuscript. The work of RD and AL (members of MERIT Collaborative Group) is funded by the Medical Research Council (MC_UU_12017/13) and the Scottish Government Chief Scientist Office (SPHSU13).10799609engBiasmeasurement reactionsReactivityRecommendationsResearch DesigntrialsR MedicineOtherRJournal article10.1016/j.jclinepi.2021.06.028139