Evidence map›Paper›PMID 26961927›Full record

ArticleThe American journal of clinical nutrition2016

Best (but oft-forgotten) practices: the design, analysis, and interpretation of Mendelian randomization studies.

Philip C Haycock, Stephen Burgess, Kaitlin H Wade, Jack Bowden, Caroline Relton, George Davey Smith

Abstract read
In one paragraph

Article in The American journal of clinical nutrition, 2016. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 358 papers, 5 of them syntheses that pooled it.

0numbers the graph read from it
0cells of the map it votes in
358citing papers in PubMed, 5 pooled it
–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

358 citing papers in PubMed, 5 syntheses or guidelines pooled it.

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298 more citing papers are in PubMed but not listed here.

4 · The record

Corrections and comments

5 · Who and what money

Authors and funding

6 authors.

Philip C Haycock
Stephen Burgess
Kaitlin H Wade
Jack Bowden
Caroline Relton
George Davey Smith

Funding

British Heart Foundation RG/08/014/24067British Heart Foundation RG/13/13/30194Cancer Research UK 19169Cancer Research UK 20138Medical Research Council G0800270Medical Research Council MC_EX_MR/L012286/1Medical Research Council MC_UP_1302/2Medical Research Council MC_UU_00002/3Medical Research Council MC_UU_00002/7Medical Research Council MC_UU_12013/1Medical Research Council MC_UU_12013/2Medical Research Council MC_UU_12013/3Medical Research Council MC_UU_12013/9Medical Research Council MR/L003120/1Medical Research Council MR/N501906/1
6 · The paper itself

Abstract

Mendelian randomization (MR) is an increasingly important tool for appraising causality in observational epidemiology. The technique exploits the principle that genotypes are not generally susceptible to reverse causation bias and confounding, reflecting their fixed nature and Mendel’s first and second laws of inheritance. The approach is, however, subject to important limitations and assumptions that, if unaddressed or compounded by poor study design, can lead to erroneous conclusions. Nevertheless, the advent of 2-sample approaches (in which exposure and outcome are measured in separate samples) and the increasing availability of open-access data from large consortia of genome-wide association studies and population biobanks mean that the approach is likely to become routine practice in evidence synthesis and causal inference research. In this article we provide an overview of the design, analysis, and interpretation of MR studies, with a special emphasis on assumptions and limitations. We also consider different analytic strategies for strengthening causal inference. Although impossible to prove causality with any single approach, MR is a highly cost-effective strategy for prioritizing intervention targets for disease prevention and for strengthening the evidence base for public health policy.

Indexed as

Research DesignCoronary Artery DiseaseCost-Benefit AnalysisDatabases, GeneticGenetic Association StudiesGenotypeHumansInterleukin-6Mendelian Randomization AnalysisPolymorphism, Single NucleotideReceptors, Interleukin-6Reproducibility of ResultsRisk FactorsInterleukin-6Receptors, Interleukin-6

Identifiers

PMID26961927
PMCPMC4807699

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.