Evidence map›Paper›PMID 33493696›Full record

ArticleClinical gastroenterology and hepatology : the official clinical practice journal of the American Gastroenterological Association2021

The Epidemiology of UK Autoimmune Liver Disease Varies With Geographic Latitude.

Gwilym J Webb, Ronan P Ryan, Tom P Marshall, Gideon M Hirschfield

Open access · hybridAbstract read
In one paragraph

Article in Clinical gastroenterology and hepatology : the official clinical practice journal of the American Gastroenterological Association, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 28 papers, 1 of them a synthesis that pooled it.

0numbers the graph read from it
0cells of the map it votes in
28citing papers in PubMed, 1 pooled it
4.7field-weighted citation impact, top 3% of its field
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

28 citing papers in PubMed, 1 synthesis or guideline pooled it, 45 citations in OpenAlex.

  1. Guideline
  2. Review
  3. Article
  4. Article
  5. Article
  6. The Geoepidemiology of Autoimmune Hepatitis.Clinical reviews in allergy & immunology · 2026
    Review
  7. Article
  8. Article
  9. Article
  10. Implementation of a care bundle improves PBC management.JHEP reports : innovation in hepatology · 2025
    Article
  11. Review
  12. Liver diseases: epidemiology, causes, trends and predictions.Signal transduction and targeted therapy · 2025
    Review
  13. Mortality in Autoimmune Liver Disease in Sweden: A Population-Based Cohort Study of 9,654 Patients.Liver international : official journal of the International Association for the Study of the Liver · 2025
    Article
  14. Article
  15. Hepatic immune regulation and sex disparities.Nature reviews. Gastroenterology & hepatology · 2024
    Review
  16. Article
  17. Article
  18. Article
  19. Article
  20. Article
4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

4 authors at 3 institutions in 2 countries.

Gwilym J WebbNational Institute for Health Research, Birmingham Biomedical Research Centre, Birmingham, United Kingdom; Cambridge Liver Unit, Addenbrooke's Hospital, Cambridge, United Kingdom.
Ronan P RyanPrimary Care Clinical Sciences, Institute of Applied Health Research, University of Birmingham, Birmingham, United Kingdom.
Tom P MarshallPrimary Care Clinical Sciences, Institute of Applied Health Research, University of Birmingham, Birmingham, United Kingdom.
Gideon M HirschfieldNational Institute for Health Research, Birmingham Biomedical Research Centre, Birmingham, United Kingdom; Division of Gastroenterology and Hepatology, Toronto Centre for Liver Disease, University of Toronto, Toronto, Ontario, Canada. Electronic address: gwilym.webb@addenbrookes.nhs.uk.
University of Birmingham · GBNational Institute for Health Research · GBUniversity of Toronto · CA

Funding

Medical Research Council
6 · The paper itself

Abstract

BACKGROUND &

aimsThe epidemiology of autoimmune liver disease (AILD) is challenging to study because of the diseases' rarity and because of cohort selection bias. Increased incidence farther from the Equator has been reported for multiple sclerosis, another autoimmune disease. We assessed the incidence of primary biliary cholangitis (PBC), primary sclerosing cholangitis (PSC), and autoimmune hepatitis (AIH) in relation to latitude.

methodsWe performed a retrospective cohort study using anonymized UK primary care records from January 1, 2002, to May 10, 2016. All adults without a baseline diagnosis of AILD were included and followed up until the first occurrence of an AILD diagnosis, death, or they left the database. Latitude was measured as registered general practice rounded down to whole degrees.

resultsThe cohort included 8,590,421 records with 53.3 × 10

conclusionsWe describe an association in the United Kingdom between more northerly latitude and the incidence of PBC and AIH that requires both confirmation and explanation.

Indexed as

Autoimmune DiseasesCholangitis, SclerosingHepatitis, AutoimmuneLiver Cirrhosis, BiliaryLiver DiseasesAdultFemaleHumansMaleRetrospective StudiesAutoimmune HepatitisAutoimmune Liver DiseaseLatitudePrimary Biliary CholangitisPrimary Sclerosing Cholangitis

Identifiers

PMID33493696
PMCPMC8661127
OpenAlexW3125172024

What OpenQuestion holds

Textmetadata
LicenceCC BY
Read underepoch 390

Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.