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The judgement of biases included in the category “other bias” in Cochrane systematic reviews of interventions: a systematic survey

Babic, Andrija, Pijuk, Andela, Brázdilová, Lucie, Georgieva, Yuliyana, Raposo Pereira, Marco António, Poklepovic Pericic, Tina, Puljak, Livia·2019·BMC Medical Research Methodology

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Crossref · 10.1186/s12874-019-0718-8

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  • The study by Babic et al. on 768 Cochrane reviews showed that 87% of reviews reported 'other bias' domain and there were 5,762 types of explanations categorized into 31 groups.

    “The study conducted by Babic et al. on 768 Cochrane reviews which included 11,369 randomized controlled trials (RCTs) showed that 87% of reviews reported “other bias” domain and there were 5,‐762 types of explanations which were categorized into 31 groups.”
  • Protocol registration and deviation from registered protocol were reported in 0.3% and 2.5% of the 'other bias' domain in RoB1, respectively.

    “Protocol registration and deviation from registered protocol were reported in 0.3% and 2.5% of the “other bias” domain in the RoB1, respectively.”
  • The study by Babic et al. on 768 Cochrane reviews showed that baseline characteristics of participants (21.4%), funding (15.6%), sample size (8.1%), reporting (7.6%), and conflicts of interest (5.8%) are the five most frequent categories reported for 'other bias' domain in systematic reviews.

    “The study by Babic et al. on 768 Cochrane reviews showed that baseline characteristics of participants (21.4%), funding (15.6%), sample size (8.1%), reporting (7.6%), and conflicts of interest (5.8%) are the five most frequent categories reported for “other bias” domain in systematic reviews.”

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Citations

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Research works printed but not linked: 13

  1. Gluud LL. Bias in clinical intervention research. Am J Epidemiol. 2006;163(6):493–501. · DOI · Paper page
  2. Higgins JP, Altman DG, Gotzsche PC, Juni P, Moher D, Oxman AD, Savovic J, Schulz KF, Weeks L, Sterne JA. The Cochrane Collaboration's tool for assessing risk of bias in randomised trials. BMJ. 2011;343:d5928. · DOI · Paper page
  3. Roberts C, Torgerson DJ. Understanding controlled trials - baseline imbalance in randomised controlled trials. Br Med J. 1999;319(7203):185. · DOI
  4. Fu R, Vandermeer BW, Shamliyan TA, O'Neil ME, Yazdi F, Fox SH. AHRQ methods for effective health care: handling continuous outcomes in quantitative synthesis. Methods guide for effectiveness and comparative effectiveness reviews. Rockville: Agency for Healthcare Research and Quality (US); 2008.
  5. Schulz KF. Subverting randomization in controlled trials. JAMA. 1995;274(18):1456–8. · DOI
  6. Higgins J. Chapter 8: assessing risk of bias in included studies. In: Higgins J, Green S, editors. Cochrane Handbook for Systematic Reviews of Interventions Version 510 (updated March 2011): The Cochrane Collaboration; 2011. [Available from https://training.cochrane.org/handbook ]. Accessed 2 Apr 2019.
  7. Lundh A, Lexchin J, Mintzes B, Schroll JB, Bero L. Industry sponsorship and research outcome. Cochrane Database Syst Rev. 2017;2:MR000033.
  8. Bero LA. Why the cochrane risk of bias tool should include funding source as a standard item. Cochrane Database Syst Rev. 2013;12:ED000075. · DOI
  9. Schulz KF, Altman DG, Moher D. CONSORT 2010 statement: updated guidelines for reporting parallel group randomised trials. BMC Med. 2010;8:18. · DOI · Paper page
  10. Propadalo I, Tranfic M, Vuka I, Barcot O, Poklepovic Pericic T, Puljak L. In Cochrane reviews risk of bias assessments for allocation concealment was frequently not in line with cochrane’s handbook guidance. J Clin Epidemiol. 2018. https://doi.org/10.1016/j.jclinepi.2018.10.002 In press. · DOI
  11. Babic A, Tokalic R, Silva Cunha JA, Novak I, Suto J, Vidak M, Miosic I, Vuka I, Poklepovic Pericic T, Puljak L. Risk of bias in cochrane systematic reviews: assessments of risk related to attrition bias are highly inconsistent. bioRxiv. 2018:366658. https://doi.org/10.1101/366658 . · DOI
  12. Barcot O, Boric M, Poklepovic Pericic T, Cavar M, Dosenovic S, Vuka I, Puljak L. Judgments of risk of bias associated with random sequence generation in trials included in Cochrane systematic reviews are frequently erroneous. BioRxiv. 2018:366674. https://doi.org/10.1101/366674 . · DOI
  13. Jordan VM, Lensen SF, Farquhar CM. There were large discrepancies in risk of bias tool judgments when a randomized controlled trial appeared in more than one systematic review. J Clin Epidemiol. 2017;81:72–6. · DOI

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Metadata

Authors
Babic, A., Pijuk, A., Brázdilová, L., Georgieva, Y., Raposo Pereira, M. A., Poklepovic Pericic, T., & Puljak, L.
Venue
BMC Medical Research Methodology
Published
2019-04-11
Volume
19
Issue
1
ISSN
1471-2288
Cited by
48
References
1
Language
en

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