Evidence map›Paper›PMID 33338606›Full record

ArticleAgeing research reviews2021

Double-counting of effect sizes and inappropriate exclusion of studies in "The influence of vitamin D supplementation on IGF-1 levels in humans: A systematic review and meta-analysis".

Mojgan Amiri, Hamidreza Raeisi-Dehkordi, Colby J Vorland, Xiwei Chen, Andrew W Brown, David B Allison

Open access · greenAbstract readComment
PubMed Full text at PMC Publisher
In one paragraph

Article in Ageing research reviews, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.

0numbers the graph read from it
0cells of the map it votes in
0citing papers in PubMed
–field-weighted citation impact, top 79% 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

0 citing papers in PubMed, 0 citations in OpenAlex.

No citing paper in PubMed yet.

4 · The record

Corrections and comments

5 · Who and what money

Authors and funding

6 authors at 3 institutions in 3 countries.

Mojgan AmiriDepartment of Epidemiology, Erasmus University Medical Center, Rotterdam, The Netherlands.
Hamidreza Raeisi-DehkordiNutrition and Food Security Research Center, Shahid Sadoughi University of Medical Sciences, Yazd, Iran; Department of Nutrition, School of Public Health, Shahid Sadoughi University of Medical Sciences, Yazd, Iran. Electronic address: hamidreza92nut@gmail.com.
Colby J VorlandDepartment of Applied Health Sciences, Indiana University School of Public Health-Bloomington, Bloomington, Indiana, USA.
Xiwei ChenDepartment of Epidemiology and Biostatistics, Indiana University School of Public Health-Bloomington, Bloomington, Indiana, USA.
Andrew W BrownDepartment of Applied Health Sciences, Indiana University School of Public Health-Bloomington, Bloomington, Indiana, USA.
David B AllisonDepartment of Epidemiology and Biostatistics, Indiana University School of Public Health-Bloomington, Bloomington, Indiana, USA.
Indiana University Bloomington · USErasmus MC · NLShahid Sadoughi University of Medical Sciences and Health Services · IR

Funding

Strengthening Causal Inference in Behavioral Obesity ResearchR25HL124208 · NHLBI · UNIVERSITY OF ALABAMA AT BIRMINGHAM · PI ALLISON, DAVID B, BROWN, ANDREW W · 2014 to 2023
$1.8M
The Mathematical Sciences in Obesity ResearchR25DK099080 · NIDDK · UNIVERSITY OF ALABAMA AT BIRMINGHAM · PI DAVID B ALLISON, Andrew W Brown · 2013 to 2026
$1.2M
NHLBI NIH HHS R25 HL124208NIDDK NIH HHS R25 DK099080
6 · The paper itself

Abstract

We read with interest the review by Kord-Varkaneh et al. which examined the effects of vitamin D supplementation on IGF-1 levels in humans. We believe that the article suffers from severe methodological faults and subsequently the conclusions are likely to be biased. Thus, the authors should address the mentioned limitations and update the analyses to provide robust and trustful estimates. We are concerned that without correction, the analyses may lead to erroneous findings and conclusions.

Indexed as

Insulin-Like Growth Factor IVitamin DDietary SupplementsHumansInsulin-Like Growth Factor IVitamin DIGF-1Letter to the editorVitamin D

Identifiers

PMID33338606
PMCPMC8817673
OpenAlexW3112428128

What OpenQuestion holds

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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.