Impact and Costs of Incentives to Reduce Attrition in Online Trials: Two Randomized Controlled Trials
BackgroundAttrition 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 par...
| Main Authors: | , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
JMIR Publications
2011-03-01
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| Series: | Journal of Medical Internet Research |
| Online Access: | http://www.jmir.org/2011/1/e26/ |