Abstract:
BACKGROUND:Low participation rates are one of the most serious disadvantages of Web-based studies. It is necessary to develop effective strategies to improve participation rates to obtain sufficient data. OBJECTIVE:The objective of this trial was to investigate the effect of emphasizing the incentive in the subject line of the invitation email and the day of the week of sending the invitation email on the participation rate in a Web-based trial. METHODS:We conducted a 2×2 factorial design randomized controlled trial. We contacted 2000 primary care physicians from members of the Japan Primary Care Association in January 2017 and randomly allocated them to 1 of 4 combinations of 2 subject lines (presence or absence of an emphasis on a lottery for an Amazon gift card worth 3000 yen or approximately US $30) and 2 delivery days (sending the invitation email on Tuesday or Friday). The primary outcome was the response rate defined as the number of participants answering the first page of the questionnaire divided by the number of invitation emails delivered. All outcomes were collected between January 17, 2017, and February 8, 2017. RESULTS:We analyzed data from 1943 out of 2000 participants after excluding those whose email addresses were invalid. The overall response rate was 6.3% (123/1943). There was no significant difference in the response rates between the 2 groups regarding incentive in the subject line: the risk ratio was 1.12 (95% CI 0.80 to 1.58) and the risk difference was 0.7% (95% CI -1.5% to 2.9%). Similarly, there was no significant difference in the response rates between the 2 groups regarding sending the email on Tuesday or Friday: the risk ratio was 0.98 (95% CI 0.70 to 1.38) and the risk difference was -0.1% (95% CI -2.3% to 2.1%). CONCLUSIONS:Neither emphasizing the incentive in the subject line of the invitation email nor varying the day of the week the invitation email was sent led to a meaningful increase in response rates in a Web-based trial with primary care physicians. TRIAL REGISTRATION:University Hospital Medical Information Network Clinical Trials Registry UMIN000025317; https://upload.umin.ac.jp/cgi-open-bin/ctr_e/ctr_view.cgi?recptno=R000029121 (Archived by WebCite at http://www.webcitation. org/6wOo1jl9t).
journal_name
J Med Internet Resjournal_title
Journal of medical Internet researchauthors
So R,Shinohara K,Aoki T,Tsujimoto Y,Suganuma AM,Furukawa TAdoi
10.2196/jmir.8561subject
Has Abstractpub_date
2018-02-08 00:00:00pages
e28issue
2eissn
1439-4456issn
1438-8871pii
v20i2e28journal_volume
20pub_type
杂志文章,随机对照试验abstract:BACKGROUND:Effectiveness of and engagement with website-delivered physical activity interventions is moderate at best. Increased exposure to Internet interventions is reported to increase their effectiveness; however, there is a lack of knowledge about which specific intervention elements are able to maintain website e...
journal_title:Journal of medical Internet research
pub_type: 杂志文章
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journal_title:Journal of medical Internet research
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journal_title:Journal of medical Internet research
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journal_title:Journal of medical Internet research
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journal_title:Journal of medical Internet research
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journal_title:Journal of medical Internet research
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journal_title:Journal of medical Internet research
pub_type: 杂志文章,随机对照试验
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journal_title:Journal of medical Internet research
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journal_title:Journal of medical Internet research
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journal_title:Journal of medical Internet research
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journal_title:Journal of medical Internet research
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journal_title:Journal of medical Internet research
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更新日期:2018-01-12 00:00:00
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更新日期:2015-06-25 00:00:00
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journal_title:Journal of medical Internet research
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更新日期:2015-06-16 00:00:00
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journal_title:Journal of medical Internet research
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journal_title:Journal of medical Internet research
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journal_title:Journal of medical Internet research
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更新日期:2019-03-01 00:00:00
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journal_title:Journal of medical Internet research
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journal_title:Journal of medical Internet research
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journal_title:Journal of medical Internet research
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