Impact and costs of incentives to reduce attrition in online trials: two randomized controlled trials.


Khadjesari, Z; Murray, E; Kalaitzaki, E; White, IR; McCambridge, J; Thompson, SG; Wallace, P; Godfrey, C; (2011) Impact and costs of incentives to reduce attrition in online trials: two randomized controlled trials. Journal of medical Internet research, 13 (1). e26. ISSN 1439-4456 DOI: https://doi.org/10.2196/jmir.1523

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Abstract

Attrition from follow-up is a major methodological challenge in randomized trials. Incentives are known to improve response rates in cross-sectional postal and online surveys, yet few studies have investigated whether they can reduce attrition from follow-up in online trials, which are particularly vulnerable to low follow-up rates.

Item Type: Article
Faculty and Department: Faculty of Public Health and Policy > Dept of Social and Environmental Health Research
Research Centre: Centre for Global Non-Communicable Diseases (NCDs)
PubMed ID: 21371988
Web of Science ID: 303670800005
URI: http://researchonline.lshtm.ac.uk/id/eprint/617

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