Academic Journal
Impact of Length or Relevance of Questionnaires on Attrition in Online Trials: Randomized Controlled Trial
| العنوان: | Impact of Length or Relevance of Questionnaires on Attrition in Online Trials: Randomized Controlled Trial |
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| المؤلفون: | McCambridge, Jim, Kalaitzaki, Eleftheria, White, Ian R, Khadjesari, Zarnie, Murray, Elizabeth, Linke, Stuart, Thompson, Simon G, Godfrey, Christine, Wallace, Paul |
| المصدر: | Journal of Medical Internet Research, Vol 13, Iss 4, p e96 (2011) |
| بيانات النشر: | JMIR Publications, 2011. |
| سنة النشر: | 2011 |
| المجموعة: | LCC:Computer applications to medicine. Medical informatics LCC:Public aspects of medicine |
| مصطلحات موضوعية: | Computer applications to medicine. Medical informatics, R858-859.7, Public aspects of medicine, RA1-1270 |
| الوصف: | BackgroundThere has been limited study of factors influencing response rates and attrition in online research. Online experiments were nested within the pilot (study 1, n = 3780) and main trial (study 2, n = 2667) phases of an evaluation of a Web-based intervention for hazardous drinkers: the Down Your Drink randomized controlled trial (DYD-RCT). ObjectivesThe objective was to determine whether differences in the length and relevance of questionnaires can impact upon loss to follow-up in online trials. MethodsA randomized controlled trial design was used. All participants who consented to enter DYD-RCT and completed the primary outcome questionnaires were randomized to complete one of four secondary outcome questionnaires at baseline and at follow-up. These questionnaires varied in length (additional 23 or 34 versus 10 items) and relevance (alcohol problems versus mental health). The outcome measure was the proportion of participants who completed follow-up at each of two follow-up intervals: study 1 after 1 and 3 months and study 2 after 3 and 12 months. ResultsAt all four follow-up intervals there were no significant effects of additional questionnaire length on follow-up. Randomization to the less relevant questionnaire resulted in significantly lower rates of follow-up in two of the four assessments made (absolute difference of 4%, 95% confidence interval [CI] 0%-8%, in both study 1 after 1 month and in study 2 after 12 months). A post hoc pooled analysis across all four follow-up intervals found this effect of marginal statistical significance (unadjusted difference, 3%, range 1%-5%, P = .01; difference adjusted for prespecified covariates, 3%, range 0%-5%, P = .05). ConclusionsApparently minor differences in study design decisions may have a measurable impact on attrition in trials. Further investigation is warranted of the impact of the relevance of outcome measures on follow-up rates and, more broadly, of the consequences of what we ask participants to do when we invite them to take part in research studies. Trial registrationISRCTN Register 31070347; http://www.controlled-trials.com/ISRCTN31070347/31070347 Archived by WebCite at (http://www.webcitation.org/62cpeyYaY) |
| نوع الوثيقة: | article |
| وصف الملف: | electronic resource |
| اللغة: | English |
| تدمد: | 1438-8871 |
| Relation: | http://www.jmir.org/2011/4/e96/; https://doaj.org/toc/1438-8871 |
| DOI: | 10.2196/jmir.1733 |
| URL الوصول: | https://doaj.org/article/3ca0b590f6f845b19300d95b15811587 |
| رقم الانضمام: | edsdoj.3ca0b590f6f845b19300d95b15811587 |
| قاعدة البيانات: | Directory of Open Access Journals |
Full Text Finder | تدمد: | 14388871 |
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| DOI: | 10.2196/jmir.1733 |