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dc.contributor.author
Wanner, Miriam
dc.contributor.author
Martin-Diener, Eva
dc.contributor.author
Bauer, Georg
dc.contributor.author
Braun-Fahrländer, Charlotte
dc.contributor.author
Brian, Martin W.
dc.date.accessioned
2019-10-28T17:18:09Z
dc.date.available
2017-06-14T16:21:29Z
dc.date.available
2019-10-28T16:05:29Z
dc.date.available
2019-10-28T17:18:09Z
dc.date.issued
2010
dc.identifier.issn
1438-8871
dc.identifier.other
10.2196/jmir.1361
en_US
dc.identifier.uri
http://hdl.handle.net/20.500.11850/159250
dc.identifier.doi
10.3929/ethz-b-000159250
dc.description.abstract
Background: Web-based interventions are popular for promoting healthy lifestyles such as physical activity. However, little is known about user characteristics, adherence, attrition, and predictors of repeated participation on open access physical activity websites. Objective: The focus of this study was Active-online, a Web-based individually tailored physical activity intervention. The aims were (1) to assess and compare user characteristics and adherence to the website (a) in the open access context over time from 2003 to 2009, and (b) between trial participants and open access users; and (2) to analyze attrition and predictors of repeated use among participants in a randomized controlled trial compared with registered open access users. Methods: Data routinely recorded in the Active-online user database were used. Adherence was defined as: the number of pages viewed, the proportion of visits during which a tailored module was begun, the proportion of visits during which tailored feedback was received, and the time spent in the tailored modules. Adherence was analyzed according to six one-year periods (2003-2009) and according to the context (trial or open access) based on first visits and longest visits. Attrition and predictors of repeated participation were compared between trial participants and open access users. Results: The number of recorded visits per year on Active-online decreased from 42,626 in 2003-2004 to 8343 in 2008-2009 (each of six one-year time periods ran from April 23 to April 22 of the following year). The mean age of users was between 38.4 and 43.1 years in all time periods and both contexts. The proportion of women increased from 49.5% in 2003-2004 to 61.3% in 2008-2009 (P< .001). There were differences but no consistent time trends in adherence to Active-online. The mean age of trial participants was 43.1 years, and 74.9% were women. Comparing contexts, adherence was highest for registered open access users. For open access users, adherence was similar during the first and the longest visits; for trial participants, adherence was lower during the first visits and higher during the longest visits. Of registered open access users and trial participants, 25.8% and 67.3% respectively visited Active-online repeatedly (P< .001). Predictors of repeated use were male sex (odds ratio [OR] = 1.2, 95% confidence interval [CI] = 1.04-1.38) and increasing age category in registered open access users, and age 46-60 versus < 30 years (OR = 3.04, 95% CI = 1.25-7.38) and Swiss nationality (ORnonSwiss= 0.64, 95% CI = 0.41-1.00) in trial participants. Despite reminder emails, attrition was much higher in registered open access users compared with trial participants, with a median lifetime website usage of 0 days in open access users and 290 days in trial participants. Conclusions: Adherence, patterns of use, attrition, and repeated participation differed between trial participants and open access users. Reminder emails to encourage repeated participation were effective for trial participants but not for registered open access users. These issues are important when interpreting results of randomized controlled effectiveness trials.
en_US
dc.format
application/pdf
en_US
dc.language.iso
en
en_US
dc.publisher
Healthcare World
en_US
dc.rights.uri
http://creativecommons.org/licenses/by/2.0/
dc.subject
Internet
en_US
dc.subject
individually tailored intervention
en_US
dc.subject
user characteristics
en_US
dc.subject
time trends
en_US
dc.title
Comparison of Trial Participants and Open Access Users of a Web-Based Physical Activity Intervention Regarding Adherence, Attrition, and Repeated Participation
en_US
dc.type
Journal Article
dc.rights.license
Creative Commons Attribution 2.0 Generic
dc.date.published
2013-03-28
ethz.journal.title
Journal of Medical Internet Research
ethz.journal.volume
12
en_US
ethz.journal.issue
1
en_US
ethz.journal.abbreviated
J Med Internet Res
ethz.pages.start
e3
en_US
ethz.size
18 p.
en_US
ethz.version.deposit
publishedVersion
en_US
ethz.identifier.nebis
005393850
ethz.publication.place
s.l.
en_US
ethz.publication.status
published
en_US
ethz.leitzahl
03494 - Wehner, Theo
en_US
ethz.leitzahl.certified
03494 - Wehner, Theo
ethz.date.deposited
2017-06-14T16:28:56Z
ethz.source
ECIT
ethz.identifier.importid
imp59364d574508253564
ethz.ecitpid
pub:43542
ethz.eth
yes
en_US
ethz.availability
Open access
en_US
ethz.rosetta.installDate
2017-07-19T09:05:35Z
ethz.rosetta.lastUpdated
2021-02-15T06:26:37Z
ethz.rosetta.versionExported
true
ethz.COinS
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