Evidence map›Paper›PMID 19941632›Full record

ArticleJournal of child psychology and psychiatry, and allied disciplines2010

Confirmation and extension of association of blood lead with attention-deficit/hyperactivity disorder (ADHD) and ADHD symptom domains at population-typical exposure levels.

Joel T Nigg, Molly Nikolas, G Mark Knottnerus, Kevin Cavanagh, Karen Friderici

Open access · greenAbstract read
In one paragraph

Article in Journal of child psychology and psychiatry, and allied disciplines, 2010. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 80 papers, 5 of them syntheses that pooled it.

0numbers the graph read from it
0cells of the map it votes in
80citing papers in PubMed, 5 pooled it
8.5field-weighted citation impact, top 2% 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

80 citing papers in PubMed, 5 syntheses or guidelines pooled it, 199 citations in OpenAlex.

  1. Pooled it
  2. Pooled it
  3. Pooled it
  4. Pooled it
  5. Pooled it
  6. Article
  7. Visualizing Parcel-Level Lead Risk Using an Exterior Housing-Based Index.International journal of environmental research and public health · 2024
    Article
  8. Article
  9. Article
  10. Review
  11. Article
  12. Article
  13. Article
  14. Neurotoxicants, the Developing Brain, and Mental Health.Biological psychiatry global open science · 2022
    Article
  15. Article
  16. Article
  17. Review
  18. Article
  19. ADHD: Reviewing the Causes and Evaluating Solutions.Journal of personalized medicine · 2021
    Review
  20. (Ascorb)ing Pb Neurotoxicity in the Developing Brain.Antioxidants (Basel, Switzerland) · 2020
    Review

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

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 at 3 institutions in 1 country.

Joel T NiggOregon Health & Science University, Department of Psychiatry, Portland, 97239-3098, USA. niggj@ohsu.edu
Molly Nikolas
G Mark Knottnerus
Kevin Cavanagh
Karen Friderici
Michigan Department of Health and Human Services · USMichigan State University · USOregon Health & Science University · US

Funding

NEUROPSYCHOLOGICAL AND FAMILIAL MARKERS FOR CHILD ADHDR01MH059105 · NIMH · OREGON HEALTH & SCIENCE UNIVERSITY · PI NIGG, JOEL T · 1999 to 2012
$3.3M
Genetics of ADHD: Haplotype and Endophenotype ApproachesR01MH070004 · NIMH · MICHIGAN STATE UNIVERSITY · PI FRIDERICI, KAREN H. · 2005 to 2009
$2.1M
Hormones in Sex-different Developmental PsychopathologyR21MH070542 · NIMH · MICHIGAN STATE UNIVERSITY · PI NIGG, JOEL T · 2005 to 2007
$475k
NIMH NIH HHS R01 MH059105NIMH NIH HHS R01 MH070004NIMH NIH HHS R01-MH070004NIMH NIH HHS R21 MH070542NIMH NIH HHS R21-MH070542
6 · The paper itself

Abstract

backgroundRecent studies have suggested that child attention-deficit/hyperactivity disorder (ADHD) and its symptom domains are related to blood lead level, even at background exposure levels typical in western countries. However, recent studies disagreed as to whether lead was related to inattention or hyperactivity-impulsivity within the ADHD domain. More definitive evaluation of these questions was sought.

methodsTwo hundred and thirty-six (236) children aged 6-17 years participated (61 ADHD-Combined type, 47 ADHD Predominantly Inattentive type, 99 non-ADHD control, 29 unclassified borderline, situational, or not otherwise specified (NOS) cases). Formal diagnosis was reliably established by a best estimate procedure based on a semi-structured clinical interview and parent and teacher ratings. Lead was assayed from whole blood using inductively coupled plasma mass spectrometry with a method detection limit of .3 microg/dL.

resultsBlood lead levels were slightly below United States and Western Europe population exposure averages, with a mean of .73 and a maximum of 2.2 microg/dL. This is the lowest level of blood lead ever studied in relation to ADHD. After statistical control for covariates including IQ and prenatal smoking exposure, blood lead was associated with ADHD-combined type but not inattentive type. Parent and teacher report indicated association of blood lead with Conners cognitive problems, but only teacher report showed effects on DSM-IV inattention symptoms. Blood lead was associated with hyperactivity-impulsivity in parent report regardless of measurement method, whereas teacher report effects depended on child treatment history.

conclusionsThese findings confirm that in children with typical US population lead exposure, careful identification of children with ADHD also identifies children with slightly elevated blood lead.

Indexed as

AdolescentAttention Deficit Disorder with HyperactivityChildCognition DisordersEnvironmental ExposureFemaleHumansLeadMaleMaternal BehaviorNeuropsychological TestsPerinatologySeverity of Illness IndexTobacco Smoke PollutionLeadTobacco Smoke Pollution

Identifiers

PMID19941632
PMCPMC2810427
OpenAlexW2136299183

What OpenQuestion holds

Textmetadata
LicenceTDM
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.