Published on 31.12.11 in Vol 13, No 4 (2011): Oct-Dec
CONSORT-EHEALTH: Improving and Standardizing Evaluation Reports of Web-based and Mobile Health Interventions
Background: Web-based and mobile health interventions (also called “Internet interventions” or "eHealth/mHealth interventions") are tools or treatments, typically behaviorally based, that are operationalized and transformed for delivery via the Internet or mobile platforms. These include electronic tools for patients, informal caregivers, healthy consumers, and health care providers. The Consolidated Standards of Reporting Trials (CONSORT) statement was developed to improve the suboptimal reporting of randomized controlled trials (RCTs). While the CONSORT statement can be applied to provide broad guidance on how eHealth and mHealth trials should be reported, RCTs of web-based interventions pose very specific issues and challenges, in particular related to reporting sufficient details of the intervention to allow replication and theory-building.
Objective: To develop a checklist, dubbed CONSORT-EHEALTH (Consolidated Standards of Reporting Trials of Electronic and Mobile HEalth Applications and onLine TeleHealth), as an extension of the CONSORT statement that provides guidance for authors of eHealth and mHealth interventions.
Methods: A literature review was conducted, followed by a survey among eHealth experts and a workshop.
Results: A checklist instrument was constructed as an extension of the CONSORT statement. The instrument has been adopted by the Journal of Medical Internet Research (JMIR) and authors of eHealth RCTs are required to submit an electronic checklist explaining how they addressed each subitem.
Conclusions: CONSORT-EHEALTH has the potential to improve reporting and provides a basis for evaluating the validity and applicability of eHealth trials. Subitems describing how the intervention should be reported can also be used for non-RCT evaluation reports. As part of the development process, an evaluation component is essential; therefore, feedback from authors will be solicited, and a before-after study will evaluate whether reporting has been improved.
J Med Internet Res 2011;13(4):e126)
- mobile health;
- reporting standards;
- publishing standards;
- quality control;
- randomized controlled trials as topic;
- medical informatics
The current issue of the Journal of Medical Internet Research (JMIR) 4/2011 is the first issue where we asked JMIR authors describing randomized trials to report their trials in accordance with a new instrument designed to improve the quality of reporting of eHealth and mHealth trials, dubbed CONSORT-EHEALTH (Consolidated Standards of Reporting Trials of Electronic and Mobile HEalth Applications and onLine TeleHealth). While completing the checklist is only mandatory for authors of randomized controlled trials (RCTs), the checklist may also be useful for researchers employing other evaluation methods. Beyond web-based and mobile applications, the checklist presented here is probably also applicable for a wide range of other medical informatics and technology applications. This editorial provides a short introduction on the rationale and background of this ongoing initiative to improve the quality of research and to improve knowledge translation in this field.
Web-based and Mobile Health Interventions
Web-based health interventions (also called “Internet interventions” or “eHealth interventions”) are, for the purpose of this paper, “treatments, typically behaviorally based, that are operationalized and transformed for delivery via the Internet” . With mobile devices being an increasingly important access point for Internet-based or otherwise networked electronic interventions, this definition includes interventions that are delivered through mobile devices or the new generation of tablet computers (eg, the iPad). Examples are behavior change interventions that help people quit smoking or lose weight, or mental health applications to address depression, anxieties, or other important health problems. An increasingly important area is the management of chronic diseases such as diabetes using Internet-based or mobile disease management programs, as well as patient-accessible personal health records, and tailored educational programs for patients. The term “treatment” should be understood in its broadest sense, and includes, for example, management tools, electronic tools that improve the communication (eg, between patient or health professionals) or systems that provide diagnostic or prognostic information or aid in the triage of patients.
Web-based and mobile interventions are increasingly important instruments in the toolkit of public health professionals and researchers [- ]. The web-based delivery mode makes it relatively easy to enroll and track a large number of participants in longitudinal studies, including RCTs, to test the effectiveness of specific program components, or to evaluate the effectiveness of the program as a whole. The ease of enrollment comes, however, at a cost: compared to face-to-face trials, researchers in eHealth trials have less control over the participants, and Internet-based trials pose some other specific problems, related to execution and reporting of the trial [ ].
While this is a young field, with less than a dozen web-based RCTs published before 2002 [, ], the number of reports evaluating web-based interventions in the medical literature is increasing rapidly. In October 2010, a scan of literature indexed in PubMed with the publication type “randomized trial” and major medical subject headings (MeSH) term “Internet”, elicited 582 published randomized trials. This does not take into account evaluations of mobile networked applications (which may not be indexed with the “Internet” keyword), or studies with nonrandomized longitudinal designs.
In addition to the rapidly growing area of Internet interventions, RCTs evaluating non-Internet interventions are also using elements of web-based trials, for example, Web-based recruitment or Web-based data collection .
While JMIR is the leading journal in this field (in terms of both impact and number of articles published in this field), these trials are scattered across a wide variety of journals: in the October 2010 scan, 263 different journals were identified which have published at least one “eHealth RCT”. While JMIR was the journal which had most trials published, the distribution has a very long tail, with relevant articles scattered in a wide range of other journals (see). As a consequence, reporting standards and the level of detail provided in these publications vary widely, hampering progress in this area, and impeding knowledge translation. While at JMIR we are requiring authors to submit the CONSORT (Consolidated Standards of Reporting Trials) checklist [ - ] and use additional checklists for some aspects of these trials (eg, Checklist for Reporting Results of Internet E-Surveys [CHERRIES] [ ]), internationally developed and adopted reporting guidelines specifically for eHealth and mHealth trials are lacking.
The CONSORT statement was developed to improve the suboptimal reporting of RCTs . While the CONSORT statement [ ] and some published extensions [ , , , ] as well as other guidelines for other study designs and domains can be applied to provide broad guidance on how such evaluations should be reported, RCTs of web-based interventions pose very specific issues and challenges [ , ], which we intended to amalgamate and elaborate in the form of a eHealth-specific CONSORT extension guideline and checklist, called CONSORT-EHEALTH.
To develop a guideline for reports of web-based interventions we broadly followed the standard methodology developed by the CONSORT group, reported in detail elsewhere . We started the work on CONSORT-EHEALTH in October 2010 with writing a grant proposal requesting funding for a consensus workshop from the Canadian Institutes of Health Research (CIHR). Unfortunately, this funding request was turned down (with some rather odd explanations, such as “[it is unclear] why journal editors [private sector] need funding to complete this project.”) Without funding, our initial plan to use a 3-phase process of premeeting item generation, a meeting with invited stakeholders, and postmeeting consolidation, had to be modified, with only a very short face-to-face workshop in the context of a scientific meeting, and the bulk of the work being conducted through online consultations.
The core international group of CONSORT-EHEALTH contributors included researchers, funders, consumers, journal editors, and industry, listed under acknowledgments. This is (and remains) an open and dynamic group.
In the premeeting item-generation process, we used the current CONSORT guideline items as a framework, and generated additional items and subitems through literature searches, extracting reported items from published RCTs as well as relevant guidelines. We had access to the referee reports of JMIR, which helped us to evaluate which items are frequently pointed out by reviewers as “missing” in the original submissions of the authors. Additional input came from a face-to-face session hosted by the International Society for Research on Internet Interventions (ISRII), in Sydney, Australia on April 6-8, 2011.
A preliminary version of the CONSORT-EHEALTH checklist (V1.5) was published in April 2010. In a web-based Delphi process we gathered some data on the importance of the items . The initial questionnaire with the list of items is shown in . Participants were asked to suggest missing items (under each CONSORT subheading), and to rate each proposed subitem on a scale of 1-5 (where 1 was “subitem not at all important” and 5 was “essential”).
We kept items as “essential” in the CONSORT-EHEALTH when at least 50% of respondents rated an item as “5-essential”. We downgraded items as “highly recommended” when at least 50% of respondents rated an item as 4 or 5 (but less than 50% said it is “essential”). We eliminated items when less than 50% of respondents answered 4 or 5.
The key references identified and used for item generation are the original CONSORT items–in particular including the extension for nonpharmacologic treatments –as well as an early paper by Eysenbach on eHealth-specific RCT issues [ ], a paper on the relevance of CONSORT reporting criteria for eHealth trials by Baker and colleagues [ ], and a preprint of a recent paper by Proudfoot and colleagues [ ]. An existing guideline for evaluation studies in health informatics [ ] proved to be too broad to be of much use. Systematic reviews in this area [ , , , ] provided further useful frameworks for identifying items that should be reported.
Based on these references, we published an initial instrument (CONSORT-EHEALTH V1.5) with 53 additional subitems, either explaining or enhancing the original 25 CONSORT items. EHEALTH-specific subitems were indicated with Roman numerals (eg, CONSORT item 2a had two additional subitems numbered 2a-i and 2a-ii). We added 2 items to the original 25-item CONSORT (item X26 on ethics, and item X27 on conflict of interest disclosure), which are not part of the original CONSORT checklist and did not fit under any existing item. This instrument was published in March 2011, and JMIR readers and eHealth stakeholders were asked to comment on the instrument and to rate the importance of each subitem.
Between April 4 and June 17 2011, we received 55 responses to CONSORT V1.5 (first Delphi round).and show the responses.
Most users agreed with all subitems. Only 1 subitem was eliminated after the first Delphi round (“Report how institutional affiliations are displayed to potential participants [on eHealth media], as affiliations with prestigious hospitals or universities may affect volunteer rates, use, and reactions with regard to an intervention”).
The resulting current iteration of CONSORT-EHEALTH V1.6.1 (which is currently in use at JMIR) has 17 subitems that are deemed “essential”, and 35 subitems that are deemed “highly recommended” (). The checklist (V1.6.1) was published on the JMIR website on August 25, 2011 and is currently being pilot-tested with the help of JMIR authors, who are asked to submit an electronic version of the checklist via an online questionnaire when they submit reports of an RCT ( ). In this questionnaire, authors of RCTs are required to quote passages of their manuscript corresponding to each item, or to quickly explain why they are not applicable. They are also asked to (on a voluntary basis) rate the importance of the items for their trial. We expect the next iteration of CONSORT-EHEALTH (V2.0) to be published early 2013, which will take into account the feedback received from actual RCT authors (who may also be acknowledged as part of the CONSORT-EHEALTH revision group). This way we ensure that the next iteration of CONSORT-EHEALTH is informed by the experiences of actual users.
Specific Reporting Issues of Ehealth Trials and Examples for Guideline Items
In the following we provide some examples of items and subitems that are part of the guideline.
For example, in the interest of reproducibility and comparability (in the research setting) as well as for implementation and dissemination (in practice settings), a detailed description and documentation of the intervention is required. The CONSORT checklist contains only a single item related to the intervention (item 5: “Describe the interventions for each group with sufficient details to allow replication, including how and when they were actually administered”). This may be sufficient for drug trials, where the simple mentioning of the drug name and its administration mode and dosage is sufficient to characterize the intervention, but not sufficient for eHealth or mHealth interventions, which are complex interventions requiring more details so that others can replicate the intervention. Thus, we created a detailed subchecklist as an extension to the CONSORT item 5, listing required and desired reporting elements characterizing the functional components and other important features of the web intervention ().
Two of these subitems (5-v and 5-vi) speak to the problem of digital preservation of the intervention, which is another unique aspect of eHealth or mHealth trials. For scientific hypotheses and findings to be confirmed or disproved by other researchers, key elements should be available to other researchers, ideally as open source code, or at least be theoretically “reproducible” by disclosing algorithms, pathways of participants through the application, etc., or at a minimum by providing screenshots or archiving the interfaces in a webarchive (such as the Internet Archive or WebCitation.org). The issue of open source and complete transparency of the algorithms appeared to be somewhat controversial among respondents, as some eHealth applications may have commercial use and some respondents were concerned about publicizing proprietary algorithms. While at JMIR we highly encourage the publication of open source code alongside the publication, there does not currently seem to be a consensus to make this a universal requirement across journals. However, even if the code is not made accessible as open source, the report must contain sufficient details and preferably screenshots to allow others to replicate or disprove the key findings – otherwise it cannot be considered scientific research and should be published in a trade journal rather than a peer-reviewed scholarly journal.
Apart from expanding the intervention description item 5, there were other important additions and expansions of the current CONSORT items.
A number of guideline subitems (6a-ii, 12a-i, 13b-i, 17-i; see) are related to the important issue of attrition (non-use) and use (engagement, “dose”, adherence) of the intervention [ ]. As participants in web-based evaluations usually have full control over whether or not they use the intervention, and how often and how long they engage with the application, real-world evaluations of web-based interventions and interpretations of reports on their effectiveness (or lack thereof) are often complicated by the fact that a substantial proportion of participants may have dropped out of the trial (non-use or loss-to-follow-up attrition) [ ]. While nonadherence may be a problem in drug trials too, the attrition rates in Internet-based trials are by far higher than in trials with a face-to-face component. As effectiveness as measured in these trials is a function of (and dependent on) participants actually using the intervention, researchers should measure and report metrics of use (adherence) and/or non-use (attrition), which can be measured using a variety of metrics such as number of logins and average session time. However, even these seemingly straightforward metrics require additional explanations, for example, if researchers report an average session time, this may be skewed by some participants never logging out; therefore, additional information such as the timeout policy should be provided (eg, automatic logout after 15 minutes of inactivity) in order to enable accurate interpretation and across-trial comparisons. In subitem 6a-ii (an expansion of CONSORT item 6 “outcomes”) we suggest that researchers explain how use and engagement was measured and defined, in addition to describing how the primary health outcomes were measured, and in subitem 17-i (an expansion of CONSORT item 17 “outcomes and estimation”) we ask that use and usage outcomes should be reported. In subitem 12a-i (an expansion of CONSORT item 12 “statistical methods”) we specifically ask how missing values due to attrition were treated statistically [ ]. In addition to the traditional CONSORT flow diagram we also highly encourage the provision of an attrition diagram (CONSORT-EHEALTH item 13b-i) in the results sections, illustrating the login behavior of participants in all groups over time as a survival curve [ ].
The comprehensive description of web-based recruitment strategies and data collection methods are other areas where we identified the need for guideline items. Our previously published CHERRIES guideline for reporting web-based surveys  may provide additional guidance and may be seen as a supplement to subitem 6a-i, which deals with the common case where outcomes were collected through online questionnaires.
There is a regrettable trend to split reports of randomized trials into “least publishable units”, for example, to publish one paper with the results of the primary RCT outcomes, another paper with usage results, and another paper with a qualitative analysis of participant feedback. At JMIR, we have a strict policy against “salami publication”, a practice that limits the ability of the reader to interpret the overall findings, and will consider such multipart papers only in exceptional circumstances, and preferably when the reports are submitted together and published in the same journal issue. An in-depth qualitative evaluation may justify a separate paper, but a few CONSORT-EHEALTH items (6a-iii and 19-ii) remind authors that some qualitative analysis should be part of any eHealth evaluation report, in particular if nonuse of the application or potential harmful effects were observed, which should shift the focus of the report to the question why these results occurred.
Finally, in order to enhance retrievability (findability) of these kinds of studies in PubMed and other bibliographic databases, we also suggest preferred terms to be used in article titles and abstracts (e.g. “web-based intervention” or “mobile intervention”). These recommendations are based on an analysis of the prevalence of terms used in current studies.
We hypothesize that publication of the guideline in August 2010 will have a significant impact on the quality of reports of web-based intervention evaluations, which will in turn enable better systematic reviews and facilitate knowledge translation. The guideline will hopefully also be a useful starting point and framework for discussions around the quality of eHealth trials, how such trials should actually be conducted, which items should be reported in protocols, grant proposals and trial registries, and how trials should be classified and synthesized in systematic reviews.
Elements of the guideline may be useful for researchers of other disciplines who use web-based recruitment or data collection methods, even if it is not an Internet- or mobile intervention which is being evaluated.
Many elements of the guideline (particularly the section describing subitems of the intervention) are applicable not only to randomized trials, but any kind of evaluation report.
While the Journal of Medical Internet Research is the first journal to adopt these guidelines, we hope that other journals and organizations endorse and adopt the guidelines. Authors are encouraged to report their research (and research protocols) in accordance with CONSORT-EHEALTH, regardless of the ultimate publication venue. Authors preparing their reports in accordance with CONSORT-EHEALTH are encouraged to cite the current guidelines (this paper), in order to facilitate further dissemination and uptake of best practices for reporting.
The current checklist is only the first step and the guideline will be very much a living document in an iterative and ongoing development process. As technology is changing constantly and rapidly, and reporting of eHealth and mHealth interventions is determined by what is technologically possible, the checklist will need to be updated much more frequently than other guidelines dealing with more “static” interventions, such as acupuncture (STRICTA) .
As part of the iterative development process, an ongoing evaluation component is essential; otherwise, asking authors, journals and editors to use and endorse the guidance is not warranted.
To provide a body of evidence to support usage of the guideline we intend to evaluate, elaborate on, and further develop the CONSORT-EHEALTH checklist, by
- a pilot implementation at the Journal of Medical Internet Research which involves collecting data from RCT authors (this pilot started with the current issue 4/2011) (see for the data collection form)
- a retrospective analysis of a random sample of web-based RCTs, published before publication of the CONSORT-EHEALTH checklist (ongoing)development of an Explanation and Elaboration manuscript
- development of a website and an interactive toolkit
- the formation of a standing working group to lead the continued development of the guideline
- a systematic analysis of RCTs of web-based interventions published after publication of the guideline, to evaluate the impact of the checklist, and to identify shortcomings and new items
- creation of a searchable database of trials (based on the information entered by JMIR authors when filling in the CONSORT-EHEALTH checklist).
It should be stressed again that the development of CONSORT-EHEALTH is an iterative and ongoing process, which requires a broad stakeholder input, which we welcome. We will continue to try to obtain funding for this important work which in our view is essential to advance the art and science of Internet and mobile interventions.
We thank David Moher and the CONSORT team, and the International Society for Research on Internet Interventions (ISRII) leadership, in particular Lee Ritterband and Helen Christensen, for supporting this project. We also thank the participants of the ISRII workshop in Sydney, in April 2011, and those who filled in the questionnaire. The following respondents opted to have their name acknowledged:
Susan Stoner; Talaria, Inc., Seattle, WA, USA
Filip Drozd; University of Oslo, Oslo, Norway
Matthijs Blankers; Academic Medical Hospital, University of Amsterdam, Amsterdam, The Netherlands
Rik Crutzen; Maastricht University/CAPHRI, Maastricht, The Netherlands
Robert Tait; Australian National University ACT, Australia
David Mohr; Northwestern University, USA
Doug Evans; George Washington University, USA
Robin Kok; VU University Amsterdam, The Netherlands
Sorayouth Chumnanvej; Mahidol University, BKK, Thailand
Pongsak Kooprasertying; Drug Information Service, Bumrungrad International Hospital, Thailand
Stephen Anthony; The University of New South Wales, Sydney, Australia
Lucy Wanjuki Kivuti; University of Nairobi, Kenya
Karen Hambly; University of Kent, Medway, UK
J.W.M. Aarts; Radboud University Nijmegen Medical Center, The Netherlands
Judith Prins; University Medical Centre St Radboud, Nijmegen, The Netherlands
Isabel de la Torre; University of Valladolid, Valladolid, Spain
Royer Cook; ISA Associates, USA
Betty C. Jung; Connecticut, USA
Richard Burkhard; San Jose State University, CA, USA
Armando Ruiz-Baques; Autonomous University of Barcelona, Barcelona, Spain
Elia Gabarron; Autonomous University of Barcelona, Barcelona, Spain
Alireza Ahmadvand; Tehran University of Medical Sciences, Tehran, Iran
Stephen Gentles; McMaster University, Canada
Sylvia Kauer; UniMelb & MCRI, Melbourne, Australia
Ólöf Birna Kristjánsdóttir; Oslo University College, Oslo, Norway
Rajneesh Choubisa; Indian Institute of Technology, Delhi, India
Emmanuel Kusi Achampong; University of Cape Coast, Ghana
Daniel Arvidsson; Center for Primary Health Care Research, Malmö, Sweden
Marie-Pierre Gagnon; Université Laval, Québec, Canada
Mahmut Gurgan; Bezmialem Vakif University, Istanbul, Turkey
Steven Daviss; University of Maryland, USA
Erin Mathieu; University of Sydney, Sydney, Australia
Michel Labrecque; Université Laval, Québec, Canada
Hansen Gottlieb Anders; University of Southern Denmark
Tuomas Lehto; University of Oulu, Oulu, Finland
Eleni Kaldoudi; Democritus University of Thrace, Alexandroupoli, Greece
Atle Klovning; University of Oslo, Oslo, Norway
Ming-Yuan Chih; University of Wisconsin Madison, Madison, WI, USA
Konstantinos Antypas; NST, Tromsø, Norway
Hilde Eide; Buskerud University College, Drammen, Norway
Terry Lewin; University of Newcastle, Newcastle, Australia
Fung Lin Elean Leung; Chinese University of Hong Kong, Hong Kong, China
Jessica Ancker; Weill Cornell Medical College, USA
Juanita Fernando; Monash University, Australia
Patrick M Archambault; Université Laval, Canada
Rodrigo Dias; Department and Institute of Psychiatry, São Paulo University Medical School, Brazil
Annie Lau; University of New South Wales, Sydney, Australia
Peter Beck; Joanneum Research, Graz, Austria
Evan Mayo-Wilson; University of Oxford, UK
Brigitte Bewick; University of Leeds, Leeds, UK
Conflicts of Interest
The author is editor and publisher of JMIR.
Multimedia Appendix 1
Online questionnaire of the initial CONSORT-EHEALTH instrument V1.5.PDF File (Adobe PDF File), 185KB
Multimedia Appendix 2
Summary of responses from the online questionnaire of CONSORT-EHEALTH V1.5 (note that narrative responses are excerpts only).PDF File (Adobe PDF File), 502KB
Multimedia Appendix 3
Database with all responses received between April 4 and June 17, 2011, in response to the CONSORT-EHEALTH V1.5 questionnaire (email addresses and certain names removed).XLS File (Microsoft Excel File), 233KB
Multimedia Appendix 4
Current CONSORT-EHEALTH V1.6.1 checklist.PDF File (Adobe PDF File), 359KB
Multimedia Appendix 5
Submission form for JMIR (based on CONSORT-EHEALTH V1.6), available at [http://tinyurl.com/consort-ehealth-v1-6].PDF File (Adobe PDF File), 211KB
- Ritterband LM, Andersson G, Christensen HM, Carlbring P, Cuijpers P. Directions for the International Society for Research on Internet Interventions (ISRII). J Med Internet Res 2006;8(3):e23 [FREE Full text] [CrossRef] [Medline]
- Wantland DJ, Portillo CJ, Holzemer WL, Slaughter R, McGhee EM. The effectiveness of Web-based vs. non-Web-based interventions: a meta-analysis of behavioral change outcomes. J Med Internet Res 2004 Nov 10;6(4):e40 [FREE Full text] [CrossRef] [Medline]
- Griffiths F, Lindenmeyer A, Powell J, Lowe P, Thorogood M. Why are health care interventions delivered over the internet? A systematic review of the published literature. J Med Internet Res 2006;8(2):e10 [FREE Full text] [CrossRef] [Medline]
- Eysenbach G. Issues in evaluating health websites in an Internet-based randomized controlled trial. J Med Internet Res 2002 Dec;4(3):E17 [FREE Full text] [CrossRef] [Medline]
- Bessell TL, McDonald S, Silagy CA, Anderson JN, Hiller JE, Sansom LN. Do Internet interventions for consumers cause more harm than good? A systematic review. Health Expect 2002 Mar;5(1):28-37. [Medline]
- El Emam K, Jonker E, Sampson M, Krleza-Jerić K, Neisa A. The use of electronic data capture tools in clinical trials: Web-survey of 259 Canadian trials. J Med Internet Res 2009;11(1):e8 [FREE Full text] [CrossRef] [Medline]
- Boutron I, Moher D, Altman DG, Schulz KF, Ravaud P, CONSORT Group. Extending the CONSORT statement to randomized trials of nonpharmacologic treatment: explanation and elaboration. Ann Intern Med 2008 Feb 19;148(4):295-309 [FREE Full text] [Medline]
- Zwarenstein M, Treweek S, Gagnier JJ, Altman DG, Tunis S, Haynes B, CONSORT group, Pragmatic Trials in Healthcare (Practihc) group. Improving the reporting of pragmatic trials: an extension of the CONSORT statement. BMJ 2008;337:a2390 [FREE Full text] [Medline]
- Moher D, Hopewell S, Schulz KF, Montori V, Gøtzsche PC, Devereaux PJ, et al. CONSORT 2010 explanation and elaboration: updated guidelines for reporting parallel group randomised trials. BMJ 2010;340:c869. [Medline]
- Campbell MK, Elbourne DR, Altman DG, CONSORT group. CONSORT statement: extension to cluster randomised trials. BMJ 2004 Mar 20;328(7441):702-708 [FREE Full text] [CrossRef] [Medline]
- Piaggio G, Elbourne DR, Altman DG, Pocock SJ, Evans SJ, CONSORT Group. Reporting of noninferiority and equivalence randomized trials: an extension of the CONSORT statement. JAMA 2006 Mar 8;295(10):1152-1160. [CrossRef] [Medline]
- Eysenbach G. Improving the quality of Web surveys: the Checklist for Reporting Results of Internet E-Surveys (CHERRIES). J Med Internet Res 2004 Sep 29;6(3):e34 [FREE Full text] [CrossRef] [Medline]
- Baker TB, Gustafson DH, Shaw B, Hawkins R, Pingree S, Roberts L, et al. Relevance of CONSORT reporting criteria for research on eHealth interventions. Patient Educ Couns 2010 Dec;81 Suppl:S77-S86. [CrossRef] [Medline]
- Moher D, Schulz KF, Simera I, Altman DG. Guidance for developers of health research reporting guidelines. PLoS Med 2010 Feb;7(2):e1000217 [FREE Full text] [CrossRef] [Medline]
- Proudfoot J, Klein B, Barak A, Carlbring P, Cuijpers P, Lange A, et al. Establishing Guidelines for Executing and Reporting Internet Intervention Research. Cognitive Behaviour Therapy 2011;40:82-97. [CrossRef]
- Talmon J, Ammenwerth E, Brender J, de Keizer N, Nykänen P, Rigby M. STARE-HI--Statement on reporting of evaluation studies in Health Informatics. Int J Med Inform 2009 Jan;78(1):1-9. [CrossRef] [Medline]
- Webb TL, Joseph J, Yardley L, Michie S. Using the internet to promote health behavior change: a systematic review and meta-analysis of the impact of theoretical basis, use of behavior change techniques, and mode of delivery on efficacy. J Med Internet Res 2010;12(1):e4 [FREE Full text] [CrossRef] [Medline]
- Cugelman B, Thelwall M, Dawes P. Online interventions for social marketing health behavior change campaigns: a meta-analysis of psychological architectures and adherence factors. J Med Internet Res 2011;13(1):e17 [FREE Full text] [CrossRef] [Medline]
- Eysenbach G. The law of attrition. J Med Internet Res 2005;7(1):e11 [FREE Full text] [CrossRef] [Medline]
- Blankers M, Koeter M, Schippers GM. Missing data approaches in eHealth research: simulation study and a tutorial for nonmathematically inclined researchers. J Med Internet Res 2010;12(5):e54 [FREE Full text] [CrossRef] [Medline]
- MacPherson H, Altman DG, Hammerschlag R, Youping L, Taixiang W, White A, STRICTA Revision Group. Revised STandards for Reporting Interventions in Clinical Trials of Acupuncture (STRICTA): extending the CONSORT statement. J Altern Complement Med 2010 Oct;16(10):ST1-S14. [CrossRef] [Medline]
Edited by G Eysenbach; This is a non-peer-reviewed article. submitted 29.08.11; accepted 31.12.11; published 31.12.11
©Gunther Eysenbach, CONSORT-EHEALTH Group. Originally published in the Journal of Medical Internet Research (http://www.jmir.org), 31.12.2011.
This is an open-access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work, first published in the Journal of Medical Internet Research, is properly cited. The complete bibliographic information, a link to the original publication on http://www.jmir.org/, as well as this copyright and license information must be included.