Evidence map›Paper›PMID 34294062›Full record

ArticleBMC pulmonary medicine2021

Lung function, COPD and cognitive function: a multivariable and two sample Mendelian randomization study.

Daniel H Higbee, Raquel Granell, Gibran Hemani, George Davey Smith, James W Dodd

Abstract read
In one paragraph

Article in BMC pulmonary medicine, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 15 papers.

0numbers the graph read from it
0cells of the map it votes in
15citing papers in PubMed
–field-weighted citation impact
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

15 citing papers in PubMed.

  1. Article
  2. Article
  3. Multiomics: Two-Sample, Bidirectional, Multivariate and Mediated Mendelian Randomization Analysis of Allergic Rhinitis.Indian journal of otolaryngology and head and neck surgery : official publication of the Association of Otolaryngologists of India · 2025
    Article
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  7. Observational
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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

5 authors.

Daniel H HigbeeMRC Integrative Epidemiology Unit (IEU), University of Bristol, Oakfield Grove, Bristol, BS8 2BN, UK.
Raquel GranellMRC Integrative Epidemiology Unit (IEU), University of Bristol, Oakfield Grove, Bristol, BS8 2BN, UK.
Gibran HemaniMRC Integrative Epidemiology Unit (IEU), University of Bristol, Oakfield Grove, Bristol, BS8 2BN, UK.
George Davey SmithMRC Integrative Epidemiology Unit (IEU), University of Bristol, Oakfield Grove, Bristol, BS8 2BN, UK.
James W DoddMRC Integrative Epidemiology Unit (IEU), University of Bristol, Oakfield Grove, Bristol, BS8 2BN, UK. James.dodd@bristol.ac.uk.ORCID http://orcid.org/0000-0003-4805-5759

Funding

Medical Research Council MC_UU_00011/1Medical Research Council MR/T005114/1Wellcome Trust 208806/Z/17/Z
6 · The paper itself

Abstract

backgroundObservational studies show an association between reduced lung function and impaired cognition. Cognitive dysfunction influences important health outcomes and is a precursor to dementia, but treatments options are currently very limited. Attention has therefore focused on identifying modifiable risk factors to prevent cognitive decline and preserve cognition. Our objective was to determine if lung function or risk of COPD causes reduced cognitive function using Mendelian randomization (MR).

methodsSingle nucleotide polymorphisms from genome wide association studies of lung function and COPD were used as exposures. We examined their effect on general cognitive function in a sample of 132,452 individuals. We then performed multivariable MR (MVMR), examining the effect of lung function before and after conditioning for covariates.

resultsWe found only weak evidence that reduced lung function (Beta - 0.002 (SE 0.02), p-value 0.86) or increased liability to COPD (- 0.008 (0.008), p-value 0.35) causes lower cognitive function. MVMR found both reduced FEV

conclusionWe did not find evidence that reduced lung function or COPD causes reduced cognitive function. Previous observational studies are probably affected by residual confounding. Research efforts should focus on shared risk factors for reduced lung function and cognition, rather than lung function alone as a modifiable risk factor.

Indexed as

CognitionFemaleHumansLungMaleMendelian Randomization AnalysisMiddle AgedMultivariate AnalysisPolymorphism, Single NucleotidePulmonary Disease, Chronic ObstructiveRespiratory Function TestsRisk Factors

Identifiers

PMID34294062
PMCPMC8296721

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Registered trials

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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.