Evidence map›Paper›PMID 30700018›Full record

SynthesisInternational journal of environmental research and public health2019

The Association between Lead and Attention-Deficit/Hyperactivity Disorder: A Systematic Review.

Gabriele Donzelli, Annalaura Carducci, Agustin Llopis-Gonzalez, Marco Verani, Agustin Llopis-Morales, Lorenzo Cioni, María Morales-Suárez-Varela

Open access · goldAbstract readSystematic Review
In one paragraph

Synthesis in International journal of environmental research and public health, 2019. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 27 papers, 3 of them syntheses that pooled it.

0numbers the graph read from it
0cells of the map it votes in
27citing papers in PubMed, 3 pooled it
6.1field-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

27 citing papers in PubMed, 3 syntheses or guidelines pooled it, 78 citations in OpenAlex.

  1. Pooled it
  2. Effects of prenatal exposure to NOEnvironmental science and pollution research international · 2020
    Pooled it
  3. Pooled it
  4. Article
  5. Article
  6. Article
  7. Article
  8. Article
  9. Article
  10. Environmental lead risk in the 21st century.Communications earth & environment · 2025
    Review
  11. Article
  12. Article
  13. Article
  14. Article
  15. Article
  16. Review
  17. The Association between ADHD and Environmental Chemicals-A Scoping Review.International journal of environmental research and public health · 2022
    Article
  18. Article
  19. Review
  20. Review
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 3 institutions in 2 countries.

Gabriele DonzelliDepartment of Preventive Medicine and Public Health, Food Sciences, Toxicology and Legal Medicine, School of Pharmacy, Universitat de Valencia. Avenida Vicente Andres Estellés s/n, Burjassot, 46100 Valencia, Spain. gabriele.donzelli@for.unipi.it.ORCID 0000-0002-3365-3732
Annalaura CarducciDepartment of Biology, University of Pisa, Via Luca Ghini, 13-56126 Pisa, Italy. annalaura.carducci@unipi.it.ORCID 0000-0003-0131-053X
Agustin Llopis-GonzalezDepartment of Preventive Medicine and Public Health, Food Sciences, Toxicology and Legal Medicine, School of Pharmacy, Universitat de Valencia. Avenida Vicente Andres Estellés s/n, Burjassot, 46100 Valencia, Spain. agustin.llopis@uv.es.
Marco VeraniDepartment of Biology, University of Pisa, Via Luca Ghini, 13-56126 Pisa, Italy. marco.verani@unipi.it.
Agustin Llopis-MoralesDepartment of Preventive Medicine and Public Health, Food Sciences, Toxicology and Legal Medicine, School of Pharmacy, Universitat de Valencia. Avenida Vicente Andres Estellés s/n, Burjassot, 46100 Valencia, Spain. agustinllopis@gmail.com.
Lorenzo CioniScuola Normale Superiore, Piazza dei Cavalieri, 7-56126 Pisa, Italy. lorenzo.cioni@sns.it.ORCID 0000-0002-2698-2714
María Morales-Suárez-VarelaDepartment of Preventive Medicine and Public Health, Food Sciences, Toxicology and Legal Medicine, School of Pharmacy, Universitat de Valencia. Avenida Vicente Andres Estellés s/n, Burjassot, 46100 Valencia, Spain. Maria.M.Morales@uv.es.ORCID 0000-0003-0785-1492
Universitat de València · ESUniversity of Pisa · ITScuola Normale Superiore · IT

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

The etiology of Attention-Deficit/Hyperactivity Disorder (ADHD) is complex and multifactorial. Although the development of ADHD symptoms remains to be elucidated, in recent years, epigenetic processes have emerged as candidate mechanisms. Lead is one of the most dangerous environmental pollutants, and it is suspected to be associated with ADHD. The aim of the present study was to review the epidemiological literature currently available on the relation between lead exposure and the diagnosis of ADHD. The PubMed and EMBASE databases were searched from 1 July 2018 up to 31 July 2018. The authors included observational studies (cohort, case⁻control and cross-sectional studies) published in English carried out on children within the last 5 years, measuring lead exposure and health outcomes related to ADHD. Seventeen studies met the inclusion criteria: 5 of these studies found no association between lead exposure and ADHD whereas the remaining 12 studies showed positive associations, even though not all of them were homogeneous in terms of exposure periods considered or ADHD diagnosis. To conclude, the evidence from the studies allowed us to establish that there is an association between lead and ADHD and that even low levels of lead raise the risk. However, there is still a lack of longitudinal studies about the relationship between lead exposure and the development of ADHD. Given the potential importance for public health, further research that includes the entire potential risk factors for ADHD in children must be encouraged.

Indexed as

AdolescentAttention Deficit Disorder with HyperactivityChildChild, PreschoolEnvironmental PollutantsHumansInfantInfant, NewbornLeadEnvironmental PollutantsLeadADHDAttention-Deficit/Hyperactivity Disorderenvironmental pollutantsLeadobservational studies analysissystematic review

Identifiers

PMID30700018
PMCPMC6388268
OpenAlexW2914877710

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.