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Attrition Revisited: Adherence and Retention in a Web-Based Alcohol Trial
There has also been some work characterizing participants who are more likely to drop out from studies, with better response rates reported for people who are white, older, better educated, with good Internet skills [27-31]. Bull et al [32] have had considerable success in improving retention rates in trials of online sexual health promotion.
J Med Internet Res 2013;15(8):e162
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As a sensitivity analysis, we used logistic regression to adjust for the following baseline variables that were previously found to be predictive of attrition: parent trial group allocation (DYD or comparator), age, gender, educational attainment (degree level or not), ethnicity (white British or other), whether an address was given at study entry, health state, baseline weekly alcohol consumption, and intention (scored 1 to 5).
J Med Internet Res 2011;13(4):e96
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The majority of participants were white British (84%), with a mean age of 38 years. Around half of the participants were educated to degree level and above (52%). 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).
J Med Internet Res 2011;13(1):e26
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Methodological Challenges in Online Trials
J Med Internet Res 2009;11(2):e9
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