Cochrane systematic reviews and co-publication: dissemination of evidence on interventions for ophthalmic conditions
© Wang et al. 2015
Received: 2 April 2015
Accepted: 24 August 2015
Published: 22 September 2015
Systematic reviews of interventions provide a summary of the evidence available on intervention effectiveness and harm. Cochrane systematic reviews (CSRs) have been published electronically in the Cochrane Database of Systematic Reviews (CDSR) since 1994, and co-publication (publication of a Cochrane review in another journal) has been allowed since that time, as long as the co-publishing journal has agreed to the arrangement. Although standards for co-publication were established in 2008, the frequency of co-publication and adherence to the standards have remained largely unexamined. Our objective was to examine the frequency of co-publication of Cochrane Eyes and Vision Group (CEVG) reviews, adherence to the co-publication policy, the relative numbers of citations of the two modes of publishing, and differences in times cited in CSRs with and without a co-publication.
We identified all CEVG reviews published by May 30, 2014 in The Cochrane Library. Using keywords from the title, author names, and “Cochrane Eyes and Vision Group”, we searched Google Scholar, Web of Science, Scopus, and PubMed databases to identify possible co-publications. We also emailed contact authors of all identified CEVG reviews to ask them whether they had published their CSR elsewhere. We compared each co-publication to the corresponding CEVG review for adherence to the Cochrane Policy Manual (dated June 10, 2014). We recorded the number of times each CEVG review and each co-publication had been cited by others according to Google Scholar, Web of Science, and Scopus, as of June 11, 2014.
We identified 117 CEVG reviews;19 had been co-published in 22 articles. Adherence to Cochrane policy on co-publication was moderate, with all authors complying with at least one of four requirements we addressed. Co-publications were cited more often than the corresponding CEVG reviews; CEVG reviews with at least one co-publication were cited approximately twice as often as CEVG reviews without a co-publication. The number of citations varied considerably depending on whether the CEVG review had a co-publication or not.
The findings support encouraging co-publication while maintaining the primacy of the Cochrane systematic review. Support for co-publication may be tempered by other factors such as the possibility that CEVG reviews with a co-publication covered more clinically important and timely topics than those without a co-publication. Assuming that citations are a valid measure of dissemination effectiveness, the 15-year CEVG experience with co-publication of systematic reviews suggests that Cochrane authors should be encouraged to co-publish in traditional medical journals.
KeywordsCochrane reviews Co-publication Citation
Systematic reviews of interventions aim to provide a summary of the evidence available to address a research question about intervention effectiveness and harm. Since 1994, Cochrane Systematic Reviews (CSRs) have been published electronically in the Cochrane Database of Systematic Reviews (CDSR), which is included in The Cochrane Library, and they are updated as needed. To attract authors and maximize dissemination of the reviews, the Cochrane Collaboration encourages authors to consider the option of “co-publishing” their CSRs in traditional journals alongside their CDSR publication.
Both the Cochrane Editorial and Publishing Policy Resource (referred to as the “Policy Manual” hereafter)  and The Cochrane Handbook  have delineated co-publication standards. The eight requirements for co-publication are summarized in Additional file 1; only four (one of which addresses two issues) can be examined for adherence in the text of a co-publication.
Whether to pursue co-publication in a traditional journal typically is the choice of CSR authors; in some cases, co-publication may be suggested by Cochrane review group editors when they deem the topic to be timely and of special interest to clinicians and patients. For example, the Cochrane Skin Group, which has co-published about one third of their CSRs, encourages the practice .
The objective of our cross-sectional study was to examine the frequency of co-publication of Cochrane Eyes and Vision Group (CEVG) reviews, adherence to co-publication policy, whether co-publication of CSRs in the field of eyes and vision has been associated with additional citation of CSRs, and whether CSRs with co-publications have been cited more often than CSRs without co-publications. To our knowledge, these issues have not been addressed for CSRs published by any other Cochrane review group.
For Cochrane Collaboration-related projects, the Johns Hopkins Bloomberg School of Public Health allows us to query authors about their studies without specific ethics approval. Otherwise, no humans were involved in this research project, and we did not request ethics approval for any portion of the project.
We selected for study all CEVG reviews published in the CDSR as of May 30, 2014. We identified all potential co-publications using a three-step strategy. In the first step, performed in January and February 2013, for each CEVG review, we searched Web of Science and Scopus citations for title words and the first author’s surname. In the second step, we searched Google Scholar and PubMed using the term “Cochrane eyes and vision group”. In neither the first nor the second step did we limit our searches by language of publication. In the third step, performed in March 2013, we surveyed the contact authors of all CEVG reviews via email to ask whether they had published elsewhere on the topic of their CSR, specifically, whether they had co-published a Cochrane review. When contact authors appeared on more than one CSR, we asked about all reviews on which their names appeared. We performed final searches of the CDSR and citation databases on June 11, 2014. We paired the most recent versions of the CEVG reviews with co-publications, recognizing that multiple CSRs can contribute to a single co-publication and that one CSR may lead to two or more co-publications on the same or different aspects of the research question.
We used a pre-tested online data collection form, created in Google Forms, to enter the study information for each CEVG review-co-publication pair or group. The online data collection form was pre-tested by collecting data from several randomly selected co-publications and corresponding CEVG reviews to ensure the completeness of data collection. Data extracted include the following: study characteristics such as journal of the co-publication and Journal Impact Factor (JIF), comparison of publication dates between co-publication and corresponding CSR, authorship, number of included studies, and fulfillment of each Policy Manual requirement for the co-publication that we could evaluate. Details of data extraction are provided in Additional file 2.
On June 11, 2014, we searched Google Scholar, Web of Science, and Scopus for each review and each co-publication and recorded the number of times each one had been cited. Whenever multiple versions of a CEVG review were found, we checked the citation list of each co-publication to make sure that it cited no more than one version of the same CSR. To obtain the total number of times each review was cited, we counted each time a citation was made to any version of the review. When two or more co-publications had emanated from one CEVG review topic, we summed the times cited for all co-publications. We also recorded the number of times each co-publication and corresponding CEVG review had been cited by the review authors themselves (i.e., “self-citation”). We then compared the number of citations for each co-publication and its corresponding CEVG review, identified by the three citation resources, using the Wilcoxon matched-pairs signed-rank test.
We compared the numbers of citations to CEVG reviews with co-publications to the numbers of citations of CEVG reviews without co-publications, using the Wilcoxon rank-sum test, for each of the three citation resources, including and excluding self-citations. All statistical analyses were conducted using Stata 12 (StataCorp. 2011. Stata Statistical Software: Release 12. College Station, TX: StataCorp LP).
The Policy Manual requirements for co-publication of CSRs are given in Additional file 1. Specifically, the journal version must faithfully reflect the Cochrane version, indicate that it is a secondary publication, acknowledge support from the CRG, and cite the Cochrane review. We were able to evaluate adherence to four of the requirements based on comparison of CSRs and corresponding co-publications while noting that one is a two-part requirement.
Characteristics of co-publications
Characteristics of 22 co-publications matched to 19 Cochrane Eyes and Vision Group systematic reviews
Co-publication content compared to the CEVG review
Similar but not identicala
Journal of co-publication
Indexed in Web of Science or Scopus as of publication date
General or other medical journal
Indexed in Web of Science or Scopus as of publication date
Authorship of co-publication
Identical to CEVG review
Same authors, different order
One author added or removed
Before the CEVG reviewc
Within 2 years after CEVG review
More than 2 years after CEVG review
Co-publication based on
Citation of the CEVG review by the co-publication
Not cited, but CEVG review mentioned in the text
Not cited or mentioned
Country of affiliation of co-publication first author
Number of included studies d
Same as CEVG review
Some overlap with CEVG review
Among the 18 co-publications with at least one included study, 13 (72 %) cited all studies included in the CEVG review, three (17 %) cited some of the included studies [14, 26, 32], and two (11 %) did not cite any of the included studies [16, 40].
Fulfillment of evaluable Policy Manual requirements for co-publication
1. Reflect the data and interpretation of the CSR faithfully. (Requirement 5, see Additional file 1)
All 22 co-publications (100 %) had the same conclusion (i.e., interpretation agreed) as the corresponding CEVG review, although 6/22 (27 %) included a different number of studies (i.e., data differed) from the CEVG review (Additional file 3 lists the reasons).
2. Indicate that the journal version is a secondary publication (complete republication, abridged republication, complete translation, or abridged translation). (Requirement 6)
Thirteen of the 22 co-publications (59 %) indicated that the co-publication was a secondary publication of the CEVG review (see Additional file 4).
3. Acknowledge the support of the Cochrane Review Group in publishing the CSR. (Requirement 7)
Half of the co-publications (11/22, 50 %) acknowledged the support of the CEVG.
4. Cite the corresponding CSR in the co-publication reference list and, when applicable (i.e., co-publication was published before the most recent version of the CSR), list the co-publication in the section “other published versions of this review” of the corresponding CSR. (Requirement 8)
Eleven of 22 (50 %) co-publications cited the corresponding CEVG review; 6 of 19 (32 %) CEVG reviews included the co-publication information in the “other published versions of this review” section of the CSR (Table 1).
Number of times cited
Numbers of citations of co-publications and corresponding CEVG reviews, as of June 11, 2014
Co-publication (N = 22)
No of citations, Google Scholar
No. of citations, Web of Science
No. of citations, Scopus
CEVG review (N = 19)
No. of citations, Google Scholar
No. of citations Web of Science
No. of citations, Scopus
Barsam 2012 
Barsam 2010 
Buehl 2008 
Findl 2007 
Calderon 2011 
Calderon 2011 
Calderon 2012 
Evans 2008 
Evans 2006 
Evans 2008 
Fedorowicz 2006 
Fedorowicz 2005 
Gnanaraj 2005 
Richardson 2003 
Leyland 2003 
Leyland 2001 
Lueck 2002 
Lueck 2002 
Mabey 2003 
Mabey 2002 
Sheikh 2001 
Sheikh 2000 
Sheikh 2005 
Shortt 2006 
Shortt 2006 
Shotton 2009 
Shotton 2008 
Shotton 2009 
Sivaprasad 2005 
Sivaprasad 2005 
Smeeth 1998 
Smeeth 1998 
Stanford 2003 
Gilbert 2002 
Wilhelmus 2000 
Wilhelmus 2001 
Wilkinson 1999 
Wilkinson 2001 
Wilkinson 2000 
Wormald 2005 
Wormald 2005 
3 to 183
1 to 109
0 to 130
4 to 158
0 to 78
0 to 49
Wilcoxon matched-pairs signed-rank testb
P = 0.32
P = 0.07
P = 0.004
Numbers of citations to CEVG reviews without versus with one or more co-publications
Citations from three sources
CEVG reviews without a co-publication
CEVG reviews with ≥1 co-publication
P value from Wilcoxon rank-sum test
Number of reviews
Times cited in Google Scholar, median (IQR)
18 (7 to 36)
44 (23 to 87)
P = 0.0003
Times cited in Web of Science, median (IQR)
3 (0 to 7)
7 (1 to 33)
P = 0.04
Times cited in Scopus, median (IQR)
5 (1 to 11)
9 (2 to 18)
P = 0.20
Only a small proportion of CEVG reviews (19/117, 16.2 %) had been co-published based on information available as of May 2014. The percentage of CSRs co-published has changed little since 2007 (10/51; 19.6 %) . We do not know the reason for the relatively low percentage; despite co-publication agreements with many journals, many authors (and even editors) may not be aware of them. Following a survey of authors and editors in the field of dermatology, Cochrane authors recommended that authors of CSRs who wish to co-publish their reviews ‘minimize frustration’ by first considering journals that have co-published other Cochrane reviews .
Physicians and researchers who do not use or do not have easy access to the CDSR may not be aware of important and up-to-date evidence synthesis it contains, and co-publication could provide this access. Does co-publication represent a form of duplicate publication? We do not think so, as the Cochrane review is unlikely to be “the same as” a co-publication, in that it is likely to be much longer and its structure follows a specified Cochrane format. Thus, one view could be that Cochrane is helping to reduce research waste by its co-publication policy, by making it more likely that the evidence gets to clinicians and others who can use it. It would be worth discussing whether Cochrane could do even more to reduce research waste by suggesting co-publication in open-access journals.
For the same review topic, the co-publication had been cited more often than the CEVG review, although the difference was statistically significant only within the Scopus database (Table 2). Although Web of Science and Scopus produced lower citation estimates than Google Scholar, nevertheless CEVG reviews with co-publications also had been cited about twice as often as those reviews without co-publications (Table 3).
The Policy Manual requirements for co-publication typically had not been fulfilled by the authors of CEVG reviews. All co-publications drew the same conclusions about treatment effectiveness as the corresponding CEVG reviews, including six that had different numbers of included studies. However, when co-publications appeared after or at the same time as the CEVG review (19/22 or 86 % of co-publications), only half of the co-publications acknowledged the support of the CEVG or cited the CEVG review. We recommend that the CEVG and other Cochrane Review Groups who wish to encourage co-publication monitor co-publications for fulfillment of the Cochrane policy. Adherence to co-publication policies of both Cochrane and individual journals should be important to editors of journals with co-publication agreements with Cochrane .
Thus, co-publication, when the CSR is cited properly, may bring attention to Cochrane reviews and increase dissemination. Our findings support encouraging co-publication while maintaining the primacy of the Cochrane systematic review. Support for co-publication may be tempered by other factors, of course, such as the reasons for co-publication, a topic we have not explored in this study. For example, it is possible that CEVG review authors are more likely to pursue a co-publication for more clinically important and timely topics or for more complex systematic reviews and meta-analyses. In addition, we do not know whether any authors of CEVG reviews prepared their findings for co-publication only to have their manuscript rejected by editors who saw no need to use journal space to publish information already publicly available.
As far as we know, the notion of co-publication, per se, is unique to Cochrane systematic reviews. This is likely because the Cochrane Collaboration has, from its beginning in 1993, wanted to attract authors who sought publishing outlets in addition to The Cochrane Library. The Agency for Healthcare Research and Quality, another commissioner of systematic reviews, publishes the Effective Healthcare Programs full reviews on its website (http://www.ahrq.gov/research/findings/evidence-based-reports/) and encourages authors to publish a shorter version elsewhere as well (e.g., http://www.jclinepi.com/content/jce-AHRQ-Series).
Discussion within Cochrane as to whether authors should be encouraged to co-publish in other journals has mainly concerned broader dissemination and providing opportunities for attracting authors. For example, it is possible that co-publications will be read and cited by physicians and scientists and thus may lead readers to consult the full Cochrane review; if this assumption is correct, co-publication is one way to disseminate findings of Cochrane reviews and to increase their influence. On the other hand, co-publications may attract attention to the co-publishing journal and may not draw attention to Cochrane reviews; if this assumption is correct, Cochrane reviews may be less cited and less influential than the co-publications. Furthermore, if co-publications are cited more often than Cochrane reviews, review authors may be motivated to publish first in journals other than The Cochrane Library. Some review groups have asked whether it is a good idea to write to authors of systematic reviews published elsewhere to convert their reviews to CSRs. We found little evidence that this strategy had been employed in the CEVG, since in only 3/22 cases of co-publication of CEVG reviews was there evidence that the CSR was completed after the co-publication [10, 39, 41].
We observed a tendency to increased citation of co-publications over the CEVG reviews, regardless of the database used to identify citations; however, the numbers of citations identified by each source varied. Web of Science had the smallest number of citations among the three databases, and Google Scholar had the greatest number of citations for both CEVG reviews and corresponding co-publications. We noted that Google Scholar took into account the numbers cited for multiple versions of CSRs and had not removed duplicate citations. We expect that there are other differences between databases that account for discrepancies in numbers of citations of both co-publications and CSRs, but we did not seek to understand these discrepancies in any depth.
Although we imposed no language restrictions on our search, we did not attempt to search any non-English database. Given this fact, the lack of response from ten contact authors to our inquiry and domination of Web of Science, Scopus, Google Scholar, and PubMed by English-language journals, it is possible that we missed co-publications not in the English language. We also did not survey review authors regarding their reasons for co-publishing their CEVG review or choosing not to do so.
The JIF, a ratio reflecting the number of citations to articles published in a specific journal during the previous 2 years divided by the total number of citable articles published in the journal, is considered by many publishers, readers, authors, and reviewers to be a marker of a journal’s importance. The CDSR received its first impact factor in 2007 (4.654) and its most recent JIF in 2014 (6.032). This may not reflect the “impact” of CEVG reviews however. To understand how the JIF and other considerations have affected authors’ decisions to co-publish or not, further surveys of review authors, both those who have co-published and those who have not, would be required. Editors also may be a factor in co-publication. A 2008 survey of dermatology journal editors found that most (6/11) editors who had co-published Cochrane reviews believed that co-publication of the review could increase their journal’s impact factor .
The Cochrane Back Review Group also recently examined co-publication and had similar findings to our own . With 62 published reviews, as of Issue 4, 2013 of The Cochrane Library, and 59 co-publications (some Cochrane reviews had more than one co-publication), a greater proportion of their reviews had been co-published compared to the CEVG reviews. For the ten most frequently cited reviews from the Cochrane Back Review Group, the number of citations to co-publications were generally the same or greater than to the review itself; overall, the co-publications had been cited about two times more often than the ten top-cited Cochrane reviews.
Only about one in seven CEVG reviews have been co-published, but, when they have been, co-publications have been cited more often than the corresponding CEVG reviews. If one accepts citations to be a valid measure of dissemination effectiveness, the CEVG experience with co-publication of systematic reviews during the past 15 years suggests that authors of CEVG reviews who wish to increase dissemination of their findings should co-publish them in traditional medical journals. Cochrane review groups may be wise to invest some resources in co-publication.
Cochrane Database of Systematic Reviews
Cochrane Editorial Unit
Cochrane Eyes and Vision Group
Cochrane Review Group
Cochrane Systematic Reviews
Journal Impact Factor
World Health Organization
The authors received salary support during preparation of this manuscript from the Cochrane Eyes and Vision Group (CEVG) @ US project (Kay Dickersin, Principal Investigator), sponsored by the National Eye Institute, National Institutes of Health grant number U01 EY020522. Dr. Hawkins received an additional support from an unrestricted grant to the Wilmer Eye Institute of the Johns Hopkins School of Medicine from Research to Prevent Blindness, New York, NY.
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