Impact and Costs of Incentives to Reduce Attrition in Online Trials: Two Randomized Controlled Trials

Impact and Costs of Incentives to Reduce Attrition in Online Trials: Two Randomized Controlled Trials

Impact and Costs of Incentives to Reduce Attrition in Online Trials: Two Randomized Controlled Trials

Zarnie Khadjesari 1;  Elizabeth Murray 1;  Eleftheria Kalaitzaki 2;  Ian R. White 3;  Jim McCambridge 4;  Simon G. Thompson 3;  Paul Wallace 1;  Christine Godfrey 5

1 E-health Unit, Research Department of Primary Care and Population Health, University College London, London , GB

2 MRC General Practice Research Framework , London , GB

3 MRC Biostatistics Unit,, Institute of Public Health , Cambridge , GB

4 Centre for Research on Drugs and Health Behaviour , London School of Hygiene & Tropical Medicine, London , GB

5 Department of Health Sciences and HYMS , University of York, York , GB

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