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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

Average alcohol consumption (geometric mean) was 46 (SD 31.2) units per week, where 1 UK unit = 8 g ethanol. Follow-up rates were 55% at one month and 42% at 3 months (pilot trial) and 46% at 3 months and 34% at 12 months (main trial). In view of the paucity of literature on incentives for this population, we undertook some preliminary research to identify a range of potentially effective incentives.

Zarnie Khadjesari, Elizabeth Murray, Eleftheria Kalaitzaki, Ian R. White, Jim McCambridge, Simon G. Thompson, Paul Wallace, Christine Godfrey

J Med Internet Res 2011;13(1):e26