Evidence map›Paper›PMID 27613950›Full record

ArticleNicotine & tobacco research : official journal of the Society for Research on Nicotine and Tobacco2017

Secondhand Smoke Exposure and Low Blood Lead Levels in Association With Attention-Deficit Hyperactivity Disorder and Its Symptom Domain in Children: A Community-Based Case-Control Study.

Hyunjoo Joo, Myung-Ho Lim, Mina Ha, Ho-Jang Kwon, Seung Jin Yoo, Kyung-Hwa Choi, Ki-Chung Paik

Open access · hybridAbstract read
In one paragraph

Article in Nicotine & tobacco research : official journal of the Society for Research on Nicotine and Tobacco, 2017. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 23 papers, 6 of them syntheses that pooled it.

0numbers the graph read from it
0cells of the map it votes in
23citing papers in PubMed, 6 pooled it
3.5field-weighted citation impact, top 7% 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

23 citing papers in PubMed, 6 syntheses or guidelines pooled it, 40 citations in OpenAlex.

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  6. The Association between Lead and Attention-Deficit/Hyperactivity Disorder: A Systematic Review.International journal of environmental research and public health · 2019
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  16. Environmental Tobacco Smoke and Early Language Difficulties among U.S. Children.International journal of environmental research and public health · 2021
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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

7 authors at 1 institution in 1 country.

Hyunjoo JooDepartment of Public Health, Graduate School of Dankook University, Cheonan, Chungnam, Republic of Korea.
Myung-Ho LimDepartment of Psychology, Dankook University College of Public Service, Cheonan, Republic of Korea.
Mina HaEnvironmental Health Center, Dankook University Medical Center, Cheonan, Republic of Korea; minaha@dku.edu.
Ho-Jang KwonEnvironmental Health Center, Dankook University Medical Center, Cheonan, Republic of Korea.
Seung Jin YooEnvironmental Health Center, Dankook University Medical Center, Cheonan, Republic of Korea.
Kyung-Hwa ChoiDepartment of Preventive Medicine, Dankook University College of Medicine, Cheonan, Republic of Korea.
Ki-Chung PaikEnvironmental Health Center, Dankook University Medical Center, Cheonan, Republic of Korea.
Dankook University · KR

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

aimSecondhand smoke (SHS) is a major indoor pollutant. We examined the possible association between exposure to both SHS and low levels of lead and attention-deficit-hyperactivity disorder (ADHD) and its symptom domain in children.

methodsThis case-control study was based on the results of a community survey using the ADHD rating scale conducted in 49 elementary schools. Both cases and control subjects were confirmed by a child psychiatrist. Each case was matched with one control subject according to gender, school, and grade in school. Using a multivariate conditional logistic regression model, we analyzed 214 case-control pairs of children who ranged in age from 6 to 10 years. Urine and blood levels of cotinine and of lead were determined, and information pertaining to SHS exposure was obtained by means of a questionnaire.

resultsExposure to low levels of lead (geometric mean = 1.65 µg/dL) was related to ADHD, particularly inattention (odds ratio [OR] = 1.67, 95% confidence interval [CI] = 1.07-2.59), whereas SHS exposure was associated mainly with hyperactivity/impulsivity (OR = 3.85, 95% CI = 1.55-9.56). In the pathway from blood lead to hyperactivity/impulsivity, children's SHS exposure mediated and indirectly accounted for about 73% of this relationship. The combined exposure to lead and SHS synergistically increased the risk of ADHD, evident as both inattention and hyperactivity/impulsivity.

conclusionSHS, which is associated with hyperactivity/impulsivity in particular, combined with exposure to low blood levels of lead synergistically increased the risk of ADHD. Therefore, the exposure of children to both SHS and lead needs to be reduced. IMPLICATIONS: Although exposure to low levels of lead has been shown to be associated with ADHD, there is little evidence of symptom domain specificity. In our study, low blood lead levels were related to inattention. In addition, prenatal or postnatal exposure to SHS increased the risk of ADHD, particularly hyperactivity/impulsivity. Combined exposure to lead and SHS synergistically increased the risk for both these ADHD symptom domains. To protect children from environmental risk factors related to ADHD, it is necessary to further reduce children's exposure to SHS and lead, even in those with low blood lead levels.

Indexed as

Attention Deficit Disorder with HyperactivityCase-Control StudiesChildCotinineFemaleHumansImpulsive BehaviorLeadLogistic ModelsMaleOdds RatioRisk FactorsSchoolsSmokingTobacco Smoke PollutionCotinineLeadTobacco Smoke Pollution

Identifiers

PMID27613950
PMCPMC5157713
OpenAlexW2462553664

What OpenQuestion holds

Textmetadata
LicenceCC BY-NC-ND
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.