Evidence map›Paper›PMID 24889852›Full record

Observational studyBMJ open2014

Prediction of liver disease in patients whose liver function tests have been checked in primary care: model development and validation using population-based observational cohorts.

David J McLernon, Peter T Donnan, Frank M Sullivan, Paul Roderick, William M Rosenberg, Steve D Ryder, John F Dillon

Open access · goldAbstract readObservational StudyValidation Study
In one paragraph

Observational study in BMJ open, 2014. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 14 papers, 1 of them a synthesis that pooled it.

0numbers the graph read from it
0cells of the map it votes in
14citing papers in PubMed, 1 pooled it
1.3field-weighted citation impact, top 20% 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

14 citing papers in PubMed, 1 synthesis or guideline pooled it, 29 citations in OpenAlex.

  1. Guideline
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  10. GPs' experiences and perceptions of early detection of liver disease: a qualitative study in primary care.The British journal of general practice : the journal of the Royal College of General Practitioners · 2018
    Article
  11. Article
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  13. Review
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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

7 authors at 6 institutions in 2 countries.

David J McLernonMedical Statistics Team, Division of Applied Health Sciences, College of Life Sciences and Medicine, University of Aberdeen, Aberdeen, UK.
Peter T DonnanDundee Epidemiology and Biostatistics Unit, Division of Population Health Sciences, Medical Research Institute, University of Dundee, Dundee, UK.
Frank M SullivanDepartment of Community and Family Medicine, University of Toronto, Toronto, Canada.
Paul RoderickAcademic Unit of Primary Care and Population Sciences, Faculty of Medicine, University of Southampton, Southampton, UK.
William M RosenbergCentre for Hepatology, Division of Medicine and ULCH-UCL NIHR Biomedical Research Centre, University College London, London, UK.
Steve D RyderDepartment of Gastroenterology, Nottingham University Hospitals NHS Trust and Biomedical Research Unit, Nottingham, UK.
John F DillonMedical Research Institute, University of Dundee, Dundee, UK.
University of Dundee · GBNottingham University Hospitals NHS Trust · GBUniversity College London · GBUniversity of Aberdeen · GBUniversity of Southampton · GBUniversity of Toronto · CA

Funding

Chief Scientist Office PDF/12/06Department of Health 03/38/02Medical Research Council MC_PC_13040Medical Research Council MR/K007017/1Medical Research Council MR/M501633/1
6 · The paper itself

Abstract

objectiveTo derive and validate a clinical prediction model to estimate the risk of liver disease diagnosis following liver function tests (LFTs) and to convert the model to a simplified scoring tool for use in primary care.

designPopulation-based observational cohort study of patients in Tayside Scotland identified as having their LFTs performed in primary care and followed for 2 years. Biochemistry data were linked to secondary care, prescriptions and mortality data to ascertain baseline characteristics of the derivation cohort. A separate validation cohort was obtained from 19 general practices across the rest of Scotland to externally validate the final model.

settingPrimary care, Tayside, Scotland.

participantsDerivation cohort: LFT results from 310 511 patients. After exclusions (including: patients under 16 years, patients having initial LFTs measured in secondary care, bilirubin >35 μmol/L, liver complications within 6 weeks and history of a liver condition), the derivation cohort contained 95 977 patients with no clinically apparent liver condition. Validation cohort: after exclusions, this cohort contained 11 653 patients. PRIMARY AND SECONDARY OUTCOME MEASURES: Diagnosis of a liver condition within 2 years.

resultsFrom the derivation cohort (n=95 977), 481 (0.5%) were diagnosed with a liver disease. The model showed good discrimination (C-statistic=0.78). Given the low prevalence of liver disease, the negative predictive values were high. Positive predictive values were low but rose to 20-30% for high-risk patients.

conclusionsThis study successfully developed and validated a clinical prediction model and subsequent scoring tool, the Algorithm for Liver Function Investigations (ALFI), which can predict liver disease risk in patients with no clinically obvious liver disease who had their initial LFTs taken in primary care. ALFI can help general practitioners focus referral on a small subset of patients with higher predicted risk while continuing to address modifiable liver disease risk factors in those at lower risk.

Indexed as

Models, StatisticalPrimary Health CareAdultAgedCohort StudiesFemaleHumansLiver DiseasesLiver Function TestsMaleMiddle AgedPredictive Value of TestsRisk AssessmentScotlandEPIDEMIOLOGYPRIMARY CARE

Identifiers

PMID24889852
PMCPMC4054629
OpenAlexW2111377654

What OpenQuestion holds

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LicenceCC BY
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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.