Cited by 162Academic Writing and PublishingPublishing and Scholarly CommunicationAcademic integrity and plagiarism

How accurate are quotations and references in medical journals?

Open access
de Lacey, G, Record, C, Wade, J·1985·BMJ

Abstract

The accuracy of quotations and references in six medical journals published during January 1984 was assessed. The original author was misquoted in 15% of all references, and most of the errors would have misled readers. Errors in citation of references occurred in 24%, of which 8% were major errors--that is, they prevented immediate identification of the source of the reference. Inaccurate quotations and citations are displeasing for the original author, misleading for the reader, and mean that untruths become 'accepted fact.'

Integrity signals

Registry

Crossref · 10.1136/bmj.291.6499.884

Cites

13 of 13 references verified0 citation errors · 0 not checkable

Statistics

Nothing to recompute.

Claims the paper makes

0 of 1 cited sources checked · 0 supported · 0 flagged

  • Findingown data

    Of all references, 12% contained errors that either slightly misled the reader or seriously misrepresented the original.

    “Of all references, 12% contained errors in these two categories.”
    Quote in the paperSubstantial claim
    • Rests on an assumption: The six selected journals are representative of medical journals generally.
    • Rests on an assumption: The first issue of each journal published during 1984 is representative of that journal's overall accuracy.
  • Findingown data

    Most of the errors in quotations would have misled readers.

    “and most of the errors would have misled readers.”
    Quote in the paperSubstantial claim
  • Findingown data

    Of the citation errors, 8% were major errors that prevented immediate identification of the source.

    “ofwhich 8% were major errors-that is, they prevented immediate identification of the source of the reference.”
    Quote in the paperNot a substantial claim
  • Findingown data

    Minor errors of citation were in the title of the article or an author's name or initials.

    “The minor errors were in the title of the article or an author's name or initials.”
    Quote in the paperNot a substantial claim
  • Findingown data

    The prevalence of misquotations in the different journals ranged from 10% to 20%.

    “The prevalence of misquotations in the different journals ranged from 10% to 20% (table).”
    Quote in the paperSubstantial claim
  • Classified as probably not a substantial claim. 11
  • May combine two claims. 2
  • Probably not a substantial claim: may not pass S2 (checkable), S3 (load-bearing).

    Findingnone given

    A reference often represented only a minor aspect of a paper.

    “A reference often represented only a minor aspect of a paper, and we did not attempt to record whether an error had a minor or major impact on the overall findings contained in the paper.”
    Quote in the paperNot a substantial claim
  • Probably not a substantial claim: may not pass S3 (load-bearing).

    Findingnone given

    Two of the journals in this survey contained over 400 references in their January 1984 issue.

    “for instance, two of the journals in this survey contained over 400 references in their January 1984 issue.”
    Quote in the paperNot a substantial claim
  • May combine two claims.

    Interpretationown data

    Errors occurred when a reference was not to the original source, and this appeared to be because the original source had not been read.

    “Errors occurred when a reference was not to the original source, and this appeared to be because the original source had not been read.”
    Quote in the paperSubstantial claim
  • Probably not a substantial claim: may not pass S2 (checkable), S3 (load-bearing), S4 (based).

    Interpretationreasoning

    A few errors of citation will be due to inaccurate transcription by editorial staff or printers, particularly with letters where proofs are not seen by the author.

    “A few errors of citation will undoubtedly be due to inaccurate transcription by editorial staff or printers, and this will occur particularly with letters, where proofs are not seen by the author.”
    Quote in the paperNot a substantial claim
  • Classified as probably not a substantial claim.

    Interpretationown data

    Prevalences of error of citation of 24% and over (including one of 46%) might give cause for concern regarding the accuracy of other material contained within the papers.

    “prevalences of error of citation of 24% and over (including one of 46%) might properly give cause for concern regarding the accuracy of other material contained within the papers.”
    Quote in the paperSubstantial claim
    • Rests on an assumption: The six selected journals are representative of medical journals generally.
    • Rests on an assumption: The first issue of each journal published during 1984 is representative of that journal's overall accuracy.
  • Probably not a substantial claim: may not pass S3 (load-bearing), S4 (based). May combine two claims.

    Interpretationreasoning

    If the British Medical Journal accepts full responsibility for accuracy of quotations, then its position is unsatisfactory with an error in one out of every five quotations.

    “If the British Medical 7ournal accepts full responsibility for accuracy of quotations (and we emphasise that we do not think that this is reasonable, let alone manageable) then the position of that journal is unsatisfactory with an error in one out of every five quotations.”
    Quote in the paperNot a substantial claim
  • Probably not a substantial claim: may not pass S2 (checkable), S4 (based).

    Interpretationnone given

    Virtually all errors of citation are readily and easily eliminated by careful checking of the final manuscript and galley proofs.

    “These errors are understandable, but virtually all are readily and easily eliminated by careful checking of the final manuscript and galley proofs.”
    Quote in the paperNot a substantial claim
  • Probably not a substantial claim: may not pass S3 (load-bearing).

    Study design and conductnone given

    The study did not assess emphasis or arbitrate on differences in interpretation when the differences had been made clear.

    “We did not assess emphasis or arbitrate on differences in interpretation when the differences had been made clear.”
    Quote in the paperNot a substantial claim
  • Probably not a substantial claim: may not pass S2 (checkable), S3 (load-bearing).

    Study design and conductreasoning

    Some misquotations classified as seriously misleading might appear to be only slightly so (and vice versa) to another reader.

    “Of course some misquotations classified as seriously misleading might appear to be only slightly so (and vice versa) to another reader, and it would be difficult to eliminate completely such differences in opinion.”
    Quote in the paperNot a substantial claim
  • Classified as probably not a substantial claim.

    Study design and conductnone given

    Fifty references for each issue were selected by random numbers.

    “Fifty references for each issue were then selected by random numbers.”
    Quote in the paperSubstantial claim
  • Probably not a substantial claim: may not pass S3 (load-bearing).

    Study design and conductreasoning

    The study did not attempt to record whether an error had a minor or major impact on the overall findings.

    “A reference often represented only a minor aspect of a paper, and we did not attempt to record whether an error had a minor or major impact on the overall findings contained in the paper.”
    Quote in the paperNot a substantial claim
  • Classified as probably not a substantial claim.

    Study design and conductnone given

    The study assessed only whether the findings, claims, or statements in the original work had been referred to accurately.

    “We assessed only whether the findings, claims, or statements in the original work had been referred to accurately.”
    Quote in the paperSubstantial claim
12 of 12
  • The paper relies on this without support.

    The six selected journals are representative of medical journals generally.

    “Six journals were selected.They comprised three general medical journals (the British Medical Journal, the Lancet, and the New England Journal of Medicine); two specialist journals (Clinical Radiology and the British Journal ofSurgery); and a journal with a high proportion ofreview articles”
  • The paper relies on this without support.

    The first issue of each journal published during 1984 is representative of that journal's overall accuracy.

    “The first issue of each journal published during 1984 was obtained.”
  • The paper relies on this without support.

    Unverifiable references would have contained errors if they could be verified.

    “It should be noted that the overall prevalence of errors we found is probably an underestimate, as all the journals contained some references that could not be verified (table ).”
3 of 3

Claims other papers make about this one

Each is checked against this paper’s own text: does it say what the citing paper says it does?

  • It is well established that reference inaccuracies are highly prevalent in the peer-reviewed literature, ranging from 4% to 48% of citations.

    “It is well established that reference inaccuracies are highly prevalent in the peer-reviewed literature, ranging from 4% to 48% of citations [8-11].”

    From High Rates of Fabricated and Inaccurate References in ChatGPT-Generated Medical Content (2023) · cites this paper as [9]

    The Results and Discussion report that citation errors were common in the six medical journals studied: 24% overall, ranging from 8% to 46% by journal. They do not support the stated 4%–48% range or establish that range across peer-reviewed literature generally. (LLM, conf=0.86)

    Experimental — accuracy not yet measured
  • The first and only systematic investigation of the overall rate of quotation errors in the general medical literature estimated that 15% of all cited assertions in published journal articles, including original research articles and literature reviews, were inaccurate.

    “In the first, and only, systematic investigation of the overall rate of quotation errors representing the general medical literature,[6] the authors estimated that 15% of all cited assertions in published journal articles (including original research articles and literature reviews) were inaccurate.”

    From Accuracy of cited "facts" in medical research articles: A review of study methodology and recalculation of quotation error rate (2017) · cites this paper as [6]

    The Abstract reports misquotations in 15% of sampled references from six medical journals and says the sample included original articles and reviews. The Discussion says quotation accuracy had not, to the authors’ knowledge, previously been assessed in medical journals, supporting the ‘first’ characterization. The paper cannot establish that it remained the ‘only’ such investigation. (LLM, conf=0.84)

    Experimental — accuracy not yet measured
  • de Lacey et al. reported a quotation error rate of 14.4% in original research articles, which is very close to the 14.5% rate calculated in the primary analysis here.

    “Notably, de Lacey et al.[6] reported a quotation error rate of 14.4% (in original research articles), which is very close to the rate 14.5% calculated in the primary analysis here.”

    From Accuracy of cited "facts" in medical research articles: A review of study methodology and recalculation of quotation error rate (2017) · cites this paper as [6]

    The Discussion reports misquotations in 15% of all references, supporting the claim's general point about quotation errors. It does not report a 14.4% rate or a rate restricted to original research articles; the Methods say the sample also included reviews, leading articles, and correspondence. The citing paper's own 14.5% calculation is not a finding attributed to de Lacey et al. (LLM, conf=0.85)

    Experimental — accuracy not yet measured
  • The primary reason for including the de Lacey et al. study representing the broad medical field was that it was the only study that examined quotation errors in the major general medical journals (BMJ, the Lancet, the NEJM).

    “The primary reason for including the de Lacey et al. study[6] representing the broad medical field was because that was only study that examined quotation errors in the major general medical journals (BMJ, the Lancet, the NEJM) and the study might be viewed as a focused study of quotation error rates in general medical journals.”

    From Accuracy of cited "facts" in medical research articles: A review of study methodology and recalculation of quotation error rate (2017) · cites this paper as [6]

    The Materials and methods section identifies the BMJ, the Lancet, and the New England Journal of Medicine as three general medical journals studied, and the Discussion reports misquotation rates. The Discussion says quotation accuracy had not, to the authors’ knowledge, previously been assessed in medical journals, but it does not establish that this remained the only such study when the citing authors selected it. (LLM, conf=0.84)

    Experimental — accuracy not yet measured
  • A secondary reason for including the de Lacey et al. study was to partially weight the overall mean of quotation errors towards the rate reported in the only study designed to estimate the rate of quotation errors throughout the medical field.

    “A secondary reason was to partially weight the overall mean of quotation errors towards the rate reported in the only study designed to estimate the rate of quotation errors throughout the medical field.”

    From Accuracy of cited "facts" in medical research articles: A review of study methodology and recalculation of quotation error rate (2017) · cites this paper as [6]

    The Abstract reports a 15% misquotation rate, and Materials and methods describes sampling six general and specialist medical journals. The Discussion says quotation accuracy had not, to the authors’ knowledge, previously been assessed in medical journals. That supports the study’s broad scope and novelty at the time, but not the unqualified claim that it was the only study designed to estimate a rate throughout the medical field. (LLM, conf=0.82)

    Experimental — accuracy not yet measured

Cites

Flagged first, then by citations

4 of the 17 references couldn’t be matched to a known paper.

Research works printed but not linked: 4

  1. Place F. Verify your references: a word to medical writers. New York Medical Journal 1916;104:697-9.
  2. Dobell C. Dr 0 Uplavici (1887-1938). Parasitology 1938;30:23941.
  3. Journal, "Pain in the ear-a presenting symptom of aortic dissection," which pointed out that the auricular nerve was a branch of the vagus. I2 My patient's gastrointestinal troubles were possibly due to implication of this nerve. Before dissection he used to talk of his wandering "hemicrania," but when no explanation could be found he began to suspect his doctors believed he was getting neurotic. Now, however, after hearing of theBMJ reports, he thinks that there should be some type of medical enigma machine to decode such a gallimaufry of symptoms as he has presented.-L S LEWIS, general practitioner, Wales.
  4. BrewsterMF. Pain intheear-apresentingsymptom ofaorticdissection. BrMedJ 1985;290: 1517.

Cited by

Sorted by citations

Authors
de Lacey, G., Record, C., & Wade, J.
Affiliations
University of Auckland (NZ)
Venue
BMJ
Publisher
BMJ
Published
1985-09-28
Volume
291
Issue
6499
Pages
884-886
ISSN
  • 0007-1447 (ISSN-L)
  • 0267-0623
  • 1468-5833
OpenAlex
W2009777888
Cited by
160
References
17
Citations by year
2026: 2 · 2025: 3 · 2024: 4 · 2023: 7 · 2022: 6 · 2021: 7 · 2020: 8 · 2019: 5 · 2018: 2 · 2017: 3 · 2016: 2 · 2015: 5 · 2014: 4 · 2013: 4 · 2012: 1
FWCI
48.61
Type
journal article
Language
en
Open access
Locations
  • BMJ (publishedVersion)
  • PubMed (publishedVersion)
Funders
Medical Research Council
Topics
  • Social Sciences › Arts and Humanities › History and Philosophy of Science › Academic Writing and Publishing
  • Social Sciences › Arts and Humanities › History and Philosophy of Science › Publishing and Scholarly Communication
  • Social Sciences › Safety Research › Academic integrity and plagiarism
Keywords
quotation errors, citation errors, medical journals, citation accuracy, misquotation, scientific integrity, editorial quality control
MeSH terms
Information Services, Periodicals as Topic, Publishing

About these checks

Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.

Claims read by deepseek-v4.1-flash under definition version 3 (extract-v3) on 2026-10-11.

Classified by jev-1.13-20260917 (gold-guideline-v0.2) on 2026-10-11.

Statistics and arithmetic are recomputed, not judged.

Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.

What counts as a claim ›How we measure confidence ›How we check this ›

Are you an author, or do you see a problem with this page? Request a review