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ORIGINAL ARTICLE
Year : 2019  |  Volume : 10  |  Issue : 4  |  Page : 168-171

Evaluation of reporting of CONSORT flow diagrams in randomized controlled trials in a national and international pharmacology journal


Department of Pharmacology, Topiwala National Medical College and BYL Nair Charitable Hospital, Mumbai, Maharashtra, India

Date of Web Publication9-Oct-2019

Correspondence Address:
Dr. Asif Moeed Shaikh
Department of Pharmacology, Topiwala National Medical College and BYL Nair Charitable Hospital, Mumbai, Maharashtra
India
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/picr.PICR_73_18

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   Abstract 

Objective: To evaluate and compare the reporting of consolidated standard of reporting trial (CONSORT) flow diagrams in randomized controlled trials (RCTs) published in a national and international pharmacology journal.
Methods: RCTs in an international pharmacology journal, European Journal of Clinical Pharmacology (EJCP), and a national journal, Indian Journal of Pharmacology (IJP), published from January 2014 to July 2016 were evaluated for reporting and completeness of CONSORT flow diagrams. A total of 138 articles (EJCP = 90; IJP = 48) were analyzed and compared.
Results: Of 138 RCTs analyzed, 90 were from EJCP and 48 were from IJP. 76.6% (69/90) articles from EJCP and 37.5% (18/48) articles from IJP had reported the CONSORT flow diagram. Of these, 95.5% (66/69) had assessed for eligibility in EJCP and 88.8% (16/18) had reported the same in IJP. The number of participants excluded was reported in 86.9% (60/69) flow diagrams in EJCP and 83.3% (15/18) in IJP. 82.6% (57/69) flow diagrams in EJCP and 77.7% (14/18) in IJP had mentioned the details of randomization. Allocation of intervention was reported in 91.3% (63/69) flow diagrams in EJCP and 88.8% (16/18) in IJP. 60.8% (42/69) flow diagrams in EJCP and 44.4% (08/18) in IJP had mentioned the details of follow-up of participants. 95.5% (66/69) flow diagrams in EJCP and 94.4% (17/18) in IJP had mentioned details about analysis.
Conclusion: In spite of both the journals, IJP and EJCP endorsing the CONSORT statement, a significant difference in the reporting of CONSORT flow diagrams in RCTs can be noted. The quality of reporting can be improved by stringent publication guidelines by the editors.

Keywords: EJCP, IJP, Thomas reuter impact factor


How to cite this article:
Shaikh AM, Mehta MM, Chawan VV. Evaluation of reporting of CONSORT flow diagrams in randomized controlled trials in a national and international pharmacology journal. Perspect Clin Res 2019;10:168-71

How to cite this URL:
Shaikh AM, Mehta MM, Chawan VV. Evaluation of reporting of CONSORT flow diagrams in randomized controlled trials in a national and international pharmacology journal. Perspect Clin Res [serial online] 2019 [cited 2019 Oct 15];10:168-71. Available from: http://www.picronline.org/text.asp?2019/10/4/168/257240


   Introduction Top


The randomized controlled trial (RCT), considered to be a gold standard in evaluating effectiveness of healthcare interventions, is now widely recognized following the movement of evidence-based medicine.[1],[2],[3]

The published RCT report should maintain the highest possible standard as it not only can have powerful and immediate impact on patient care but also removes the investigator bias in allocation of participants.[2],[4]

Interpretation of RCT results becomes difficult, if not impossible, with inadequate reports causing biased results to receive false reliability.[5] Thus, adequate reporting is essential because the readers need and deserve to know the quality of methods to make informed judgment regarding the validity of clinical trial.[2],[6]

Previous studies indicate that reports of low-quality RCTs, compared with reports of high-quality ones, overestimate the effectiveness of interventions by about 30% across the variety of health care conditions.[6],[7]

That lack of adequate reporting fueled the development of consolidated standard of reporting trial (CONSORT) statement in 1996[3],[8] and its revision 5 years later.[3],[9]

The aim of this study is to evaluate the reporting of CONSORT flow diagram in RCT in pharmacology journals.


   Methods Top


Data source

We selected two CONSORT endorsing pharmacology journals, Indian Journal of Pharmacology (IJP), a national, and European Journal of Clinical Pharmacology (EJCP), an international journal, with Thomas Reuter impact factor 0.902 and 2.32, respectively.

We conducted a search to identify RCTs published in IJP and EJCP between January 2014 and July 2016. Moreover, the website used to access was http://www. ijp-online.com/for IJP and http://www.springer.com/biomed/pharmacology+%26+toxicology/journal/228 for EJCP.

Study selection

RCTs of preventive and therapeutic interventions were selected. We included reports in which the allocation of participants to intervention was described as random, randomly allocated, randomized, or randomization. Other study designs such as observational studies, economic analysis on RCTs, quasi-randomised trials, cluster randomized trials, diagnostic and screening tests, follow-up studies of previously reported RCTs, editorials, reviews, case reports, and letters were excluded.

Data extraction

Two reviewers underwent training in evaluating RCTs using CONSORT 2010 statement with special reference to CONSORT participant flow diagram. Both the reviewers extracted data from all included papers. Discrepancies were resolved by thorough discussion and also by using kappa scores.

The following is the information required to document the flow of participants through each stage of randomized trials according to item 13 of the CONSORT checklist as shown in [Figure 1] and the same items were included in our checklist: enrolment–which includes participants assessed for eligibility and excluded before randomization, randomization, treatment allocation, follow-up details, and analysis.[10]
Figure 1: Flow diagram of the progress through the phases of parallel randomized trial of two groups (enrolment, intervention, allocation, follow-up, and data analysis)[10]

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Data analysis

Data for descriptive statistics were described as frequencies and percentages. The data were analyzed using Microsoft Excel version 2013 developed by Microsoft with Microsoft windows being the operating system.


   Results Top


Among the 138 RCTs included in the study, 65.2% (90/138) were published in EJCP and 34.7% (48/138) were published in IJP.

Of the 138 reports in the study, 63% (87/138) adhered to item 13 of the CONSORT checklist and reported the participant flow diagram. The reported component of flow diagram is shown in [Table 1], 76.6% (69/90) in EJCP and 37.5% (18/48) in IJP reported participant flow diagram.
Table 1: The reported components of flow diagram

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Details of enrolment

95.6% (66/69) in EJCP and 88.8% (16/18) in IJP had mentioned the participants assessed for eligibility in participant flow diagram.

86.6% (60/69) in EJCP and 83.3% (16/18) in IJP had reported the participants excluded during enrolment in flow diagram.

Details of randomization

82.6% (57/69) in EJCP and 77.7% (14/18) in IJP had reported about the participants randomized in the flow diagram.

Details of allocation

91.3% (63/69) in EJCP and 88.8% (16/18) in IJP had reported about participants allocated to intervention in the flow diagram.

Details of follow-up

60.8% (42/69) in EJCP and 44.4% (8/18) in IJP had reported about the participants who discontinued intervention or lost to follow-up.

Details of analysis

95.5% (66/69) in EJCP and 94.4% (17/18) in IJP had reported about the participants analyzed in the flow diagram.


   Discussion Top


The proportion of articles that included a CONSORT flow diagram varied widely across journals.

In this study, we have observed that majority of RCTs reported in two pharmacology journals, which had shown varied adherence to the flow diagram component of CONSORT guidelines. IJP (national) reported only 37.5% and EJCP (international) reported 76.67%.

A diagram showing flow of participants from enrolment to analysis is an important element of the CONSORT standards for reporting of clinical trial.

In more complex studies, it may be difficult for readers to discern whether and why some participants did not receive the treatment as allocated, were lost to follow-up, or were excluded from the analysis. Hence, knowing this information permits the reader to assess to what extent the estimated therapy might be underestimated in comparison with ideal circumstances.[10]

A study done by Uetani et al. in 2004 for the evaluation of adherence to CONSORT statement reported that only 6% of the articles had shown the flow diagram.[1]

A study done by Scott et al. in 2011 for completeness of reporting RCTs of three vaccine trials had reported only that only 43% had mentioned flow diagram among 70 publications.[11]

A study done by Jull and Aye in 2012 for quality of reporting RCTs in 15 leading nursing journals reported that 71.1% of the articles had shown participant flow diagram.[12]

Thus, the reporting of CONSORT flow diagram has improved in recent years after the CONSORT 2010 statement was laid down.[10]

We have assessed RCTs published from IJP (national) and EJCP (international); these journals have universal acceptance in the pharmacology research community. However, we still find that the reporting of flow diagram varies in two pharmacology journals which may be due to differences in the impact factors or might be because flow diagram takes up precious journal space, and the editor may sometimes feel that this space is better used otherwise. Our findings provide strong support for the idea that RCTs always should be published as full articles including a flow diagram. To the best of our knowledge, no studies have specifically evaluated the adherence to the flow diagram component of CONSORT statement.


   Conclusion Top


A participant flow diagram is highly recommended as per the CONSORT 2010 statement. In this study, we found varied adherence in IJP and EJCP to the flow diagram component of CONSORT guidelines.

Financial support and sponsorship

Nil.

Conflicts of interest

There are no conflicts of interest.

 
   References Top

1.
Uetani K, Nakayama T, Ikai H, Yonemoto N, Moher D. Quality of reports on randomized controlled trials conducted in Japan: Evaluation of adherence to the CONSORT statement. Intern Med 2009;48:307-13.  Back to cited text no. 1
    
2.
Satpute S, Mehta M, Bhete S, Kurle D. Assessment of adherence to the statistical components of consolidated standards of reporting trials statement for quality of reports on randomized controlled trials from five pharmacology journals. Perspect Clin Res 2016;7:128-31.  Back to cited text no. 2
[PUBMED]  [Full text]  
3.
Schulz KF, Altman DG, Moher D, CONSORT Group. CONSORT 2010 statement: Updated guidelines for reporting parallel group randomised trials. Trials 2010;11:32.  Back to cited text no. 3
    
4.
Bennett JA. The consolidated standards of reporting trials (CONSORT): Guidelines for reporting randomized trials. Nurs Res 2005;54:128-32.  Back to cited text no. 4
    
5.
Ghimire S, Kyung E, Kang W, Kim E. Assessment of adherence to the CONSORT statement for quality of reports on randomized controlled trial abstracts from four high-impact general medical journals. Trials 2012;13:77.  Back to cited text no. 5
    
6.
Moher D, Jones A, Lepage L, CONSORT Group (Consolidated Standards for Reporting of Trials). Use of the CONSORT statement and quality of reports of randomized trials: A comparative before-and-after evaluation. JAMA 2001;285:1992-5.  Back to cited text no. 6
    
7.
Moher D, Pham B, Jones A, Cook DJ, Jadad AR, Moher M, et al. Does quality of reports of randomised trials affect estimates of intervention efficacy reported in meta-analyses? Lancet 1998;352:609-13.  Back to cited text no. 7
    
8.
Begg C, Cho M, Eastwood S, Horton R, Moher D, Olkin I, et al. Improving the quality of reporting of randomized controlled trials. The CONSORT statement. JAMA 1996;276:637-9.  Back to cited text no. 8
    
9.
Moher D, Schulz KF, Altman DG. The CONSORT statement: Revised recommendations for improving the quality of reports of parallel-group randomised trials. Lancet 2001;357:1191-4.  Back to cited text no. 9
    
10.
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.  Back to cited text no. 10
    
11.
Scott P, Ott F, Egger M, Low N. Completeness of reporting in randomized controlled trials of 3 vaccines: A review of adherence to the CONSORT checklist. Pediatr Infect Dis J 2012;31:1286-94.  Back to cited text no. 11
    
12.
Jull A, Aye PS. Endorsement of the CONSORT guidelines, trial registration, and the quality of reporting randomised controlled trials in leading nursing journals: A cross-sectional analysis. Int J Nurs Stud 2015;52:1071-9.  Back to cited text no. 12
    


    Figures

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    Tables

  [Table 1]



 

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