Cited by 1,022Meta-analysis and systematic reviewsStatistical Methods in EpidemiologyAdvanced Causal Inference Techniques

The DOI matches its Crossref record; 22 of the 30 references it cites were found in a registry or an index; none of the 27 sources its claims cite is checked for support yet.

A tool to assess risk of bias in non-randomized follow-up studies of exposure effects (ROBINS-E)

Open access

Abstract

BACKGROUND: Observational epidemiologic studies provide critical data for the evaluation of the potential effects of environmental, occupational and behavioural exposures on human health. Systematic reviews of these studies play a key role in informing policy and practice. Systematic reviews should incorporate assessments of the risk of bias in results of the included studies. OBJECTIVE: To develop a new tool, Risk Of Bias In Non-randomized Studies - of Exposures (ROBINS-E) to assess risk of bias in estimates from cohort studies of the causal effect of an exposure on an outcome. METHODS AND RESULTS: ROBINS-E was developed by a large group of researchers from diverse research and public health disciplines through a series of working groups, in-person meetings and pilot testing phases. The tool aims to assess the risk of bias in a specific result (exposure effect estimate) from an individual observational study that examines the effect of an exposure on an outcome. A series of preliminary considerations informs the core ROBINS-E assessment, including details of the result being assessed and the causal effect being estimated. The assessment addresses bias within seven domains, through a series of 'signalling questions'. Domain-level judgements about risk of bias are derived from the answers to these questions, then combined to produce an overall risk of bias judgement for the result, together with judgements about the direction of bias. CONCLUSION: ROBINS-E provides a standardized framework for examining potential biases in results from cohort studies. Future work will produce variants of the tool for other epidemiologic study designs (e.g. case-control studies). We believe that ROBINS-E represents an important development in the integration of exposure assessment, evidence synthesis and causal inference.

Overview

AI snapshot

Written from the paper’s full text.

TL;DR

ROBINS-E is a new tool for assessing risk of bias in a specific exposure effect estimate from non-randomized cohort studies, developed by adapting ROBINS-I and RoB 2. It uses preliminary considerations, seven bias domains, signalling questions, and domain-level judgements to produce overall risk-of-bias, direction-of-bias, and threat-to-conclusions judgements.

Key findings

  • ROBINS-E assesses risk of bias in a specific result from an observational cohort study of the causal effect of an exposure on an outcome, addressing seven domains: confounding, exposure measurement, selection of participants, post-exposure interventions, missing data, outcome measurement, and selection of the reported result.
  • Development involved 43 researchers; proposals were discussed at a two-day meeting of 31 participants in Bristol in January 2017, and a draft was piloted in October 2019 by 28 in-person plus 3 remote participants; a revised draft was piloted in June–July 2021, and the launch version was posted in June 2022.
  • Domain-level judgements include risk of bias (“Low risk of bias”, “Some concerns”, “High risk of bias”, “Very high risk of bias”), predicted direction of bias, and whether the bias threatens conclusions; the default overall risk-of-bias judgement is that of the domain with the greatest risk of bias.
  • ROBINS-E does not directly assess financial conflicts of interest, and the present version addresses only follow-up (cohort) studies, with variants for other designs such as case-control studies planned.

Methods

  • Design: iterative tool development through working groups, in-person meetings, webinars, and pilot testing, following principles used for RoB 2 and ROBINS-I.
  • Data or sample: no empirical dataset was used; development involved 43 identified researchers, a 31-participant meeting in January 2017, a 2019 pilot with 28 in-person plus 3 remote participants, and a 2021 revised-draft pilot.
  • Main analysis: not stated in the paper; the article describes the tool’s structure, domains, signalling questions, and judgement algorithms rather than conducting a statistical analysis.

Limitations

  • Stated: the present version addresses only follow-up (cohort) studies, and work is ongoing to develop variants for other study designs including case-control studies.
  • Stated: assessments require judgement, so subjectivity and between-assessor variability are impossible to avoid; accuracy depends on the quality of available information, and successful use requires both content and methodological expertise.
  • Stated/evident: the tool has not yet had formal evaluation of its reliability and validity; the paper reports no empirical reliability or validity data, and the data availability statement says no data were used for the research described.

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Integrity signals

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Crossref · 10.1016/j.envint.2024.108602

Cites

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Statistics

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Claims the paper makes

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Show all 13 claims

  • It may state two separate claims as one. 9
  • Probably not a substantial claim. 37
39 of 39
  • The paper relies on this without support.

    Randomized controlled trials are often not feasible, ethical, large enough or of sufficient duration to evaluate chronic health effects.

    “Randomized controlled trials (RCTs) are often not feasible, ethical, large enough or of sufficient duration to evaluate chronic health effects.”
  • The authors state this as an assumption.

    Issues common to both randomized trials and observational studies (missing data, outcome assessment, selection of the reported result) are likely to be similar.

    “with the additional assumption that issues common to both study designs (missing data, outcome assessment, selection of the reported result) are likely to be similar”
  • The paper relies on this without support.

    Pre-specified plans for analyses are uncommon for observational studies.

    “However, such pre-specified plans are uncommon for observational studies and often the nature of the data need to be taken into account when selecting a suitable statistical model and method.”
  • The paper relies on this without support.

    The nature of the data often needs to be taken into account when selecting a suitable statistical model and method.

    “However, such pre-specified plans are uncommon for observational studies and often the nature of the data need to be taken into account when selecting a suitable statistical model and method.”
4 of 4

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Citations

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Research works printed but not linked: 2

  1. Boutron, 2019, Chapter 7: considering bias and conflicts of interest among the included studies, 177
  2. National Academies of Sciences Engineering and Medicine, 2022. A Review of U.S. EPA’s ORD Staff Handbook for Developing IRIS Assessments: 2020 Version. Washington DC: The National Academies Press.

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Metadata

Authors
Higgins, J. P. T., Morgan, R. L., Rooney, A. A., Taylor, K. W., Thayer, K. A., Silva, R. A., Lemeris, C., Akl, E. A., Bateson, T. F., Berkman, N. D., Glenn, B. S., Hróbjartsson, A., LaKind, J. S., McAleenan, A., Meerpohl, J. J., Nachman, R. M., Obbagy, J. E., O'Connor, A., Radke, E. G., Savović, J., Schünemann, H. J., Shea, B., Tilling, K., Verbeek, J., Viswanathan, M., & Sterne, J. A. C.
Affiliations
  • University of Bristol (GB)
  • McMaster University (CA)
  • National Institute of Environmental Health Sciences (US)
  • Environmental Protection Agency (US)
  • ICF International (United States) (US)
  • American University of Beirut (LB)
  • RTI International (US)
  • University of Southern Denmark (DK)
  • University of Freiburg (DE)
  • United States Department of Agriculture (US)
  • Michigan State University (US)
  • Cochrane Canada (CA)
  • Ottawa Hospital Research Institute (CA)
  • Amsterdam UMC Location University of Amsterdam (NL)
Corresponding author
Higgins, Julian P.T.
Venue
Environment International
Publisher
Elsevier BV
Published
2024-04
Volume
186
Pages
108602
ISSN
0160-4120 (ISSN-L)
OpenAlex
W4393132304
Cited by
1,022
References
30
Citations by year
2026: 470 · 2025: 440 · 2024: 112
FWCI
284.27
Type
journal article
Language
en
Open access
Locations
  • Environment International (publishedVersion, cc-by-nc-nd)
  • PubMed (publishedVersion)
  • Pure Amsterdam UMC (publishedVersion, cc-by)
  • University of Southern Denmark Research Portal (University of Southern Denmark) (publishedVersion, cc-by-nc)
  • PubMed Central (acceptedVersion, cc-by-nc)
  • Europe PMC (PubMed Central) (acceptedVersion, cc-by-nc)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
  • Bristol Research (University of Bristol) (submittedVersion, cc-by-nc-nd)
  • Explore Bristol Research (submittedVersion, cc-by-nc-nd)
Funders
  • National Institute for Health and Care Research
  • Cancer Research UK
  • National Institute of Environmental Health Sciences
Topics
  • Social Sciences › Decision Sciences › Statistics, Probability and Uncertainty › Meta-analysis and systematic reviews
  • Physical Sciences › Mathematics › Statistics and Probability › Statistical Methods in Epidemiology
  • Physical Sciences › Mathematics › Statistics and Probability › Advanced Causal Inference Techniques
Keywords
risk of bias assessment, non-randomized studies, cohort studies, causal inference, systematic review methodology, observational epidemiology
MeSH terms
Environmental Exposure, Follow-Up Studies, Humans, Cohort Studies, Bias, Epidemiologic Studies, Risk Assessment, Observational Studies as Topic

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