Evidence map›Paper›PMID 27490560›Full record

ArticleInternational journal of environmental research and public health2016

The Impact of Low-Level Lead Toxicity on School Performance among Hispanic Subgroups in the Chicago Public Schools.

Michael J Blackowicz, Daniel O Hryhorczuk, Kristin M Rankin, Dan A Lewis, Danish Haider, Bruce P Lanphear, Anne Evens

Open access · goldAbstract read
In one paragraph

Article in International journal of environmental research and public health, 2016. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 11 papers, 1 of them a synthesis that pooled it.

0numbers the graph read from it
0cells of the map it votes in
11citing papers in PubMed, 1 pooled it
1.5field-weighted citation impact, top 19% 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

11 citing papers in PubMed, 1 synthesis or guideline pooled it, 24 citations in OpenAlex.

  1. Pooled it
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  10. A Review of the Field on Children's Exposure to Environmental Contaminants: A Risk Assessment Approach.International journal of environmental research and public health · 2017
    Review
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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 4 institutions in 2 countries.

Michael J BlackowiczDivision of Epidemiology and Biostatistics, University of Illinois at Chicago School of Public Health, Chicago, IL 60612, USA. mblack21@uic.edu.
Daniel O HryhorczukCenter for Global Health, University of Illinois College of Medicine, Chicago, IL 60612, USA. dhryhorc@uic.edu.
Kristin M RankinDivision of Epidemiology and Biostatistics, University of Illinois at Chicago School of Public Health, Chicago, IL 60612, USA. krankin@uic.edu.
Dan A LewisSchool of Education and Social Policy, Northwestern University, Evanston, IL 60208, USA. dlewis@northwestern.edu.
Danish HaiderCenter for Global Health, University of Illinois College of Medicine, Chicago, IL 60612, USA. danish.haider@gmail.com.
Bruce P LanphearChild & Family Research Institute, BC Children's Hospital and Faculty of Health Sciences, Simon Fraser University, Vancouver, BC V5Z 4H4, Canada. blanphear@sfu.ca.
Anne EvensDivision of Environmental and Occupational Health Sciences, University of Illinois at Chicago School of Public Health, Chicago, IL 60612, USA. anne.evens@elevateenergy.org.
University of Illinois Chicago · USBritish Columbia Children's Hospital · CACenter for Global Health · USNorthwestern University · US

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

backgroundEnvironmental lead exposure detrimentally affects children's educational performance, even at very low blood lead levels (BLLs). Among children in Chicago Public Schools (CPS), the severity of the effects of BLL on reading and math vary by racial subgroup (White vs. Hispanic vs. non-Hispanic Black). We investigated the impact of BLL on standardized test performance by Hispanic subgroup (Mexican, Puerto Rican, and Other Hispanic).

methodsWe examined 12,319 Hispanic children born in Chicago between 1994 and 1998 who were tested for BLL between birth and 2006 and enrolled in the 3rd grade at a CPS school between 2003 and 2006. We linked the Chicago birth registry, the Chicago Blood Lead Registry, and 3rd grade Illinois Standard Achievement Test (ISAT) scores to examine associations between BLL and school performance. Primary analyses were restricted to children with BLL below 10 µg/dL (0.483 µmol/L).

resultsBLLs below 10 µg/dL (0.483 µmol/L) were inversely associated with reading and math scores in all Hispanic subgroups. Adjusted Relative Risks (RRadj) and 95% confidence intervals (CI) for reading and math failure were 1.34 (95% CI = 1.25, 1.63) and 1.53 (95% CI = 1.32, 1.78), respectively, per each additional 5 µg/dL of lead exposure for Hispanic children; RRadj did not differ across subgroups. We estimate that 7.0% (95% CI = 1.8, 11.9) of reading and 13.6% (95% CI = 7.7, 19.2) of math failure among Hispanic children can be attributed to exposure to BLLs of 5-9 µg/dL (0.242 to 0.435 µmol/L) vs. 0-4 µg/dL (0-0.193 µmol/L). The RRadj of math failure for each 5 µg/dL (0.242 µmol/L) increase in BLL was notably (p = 0.074) stronger among black Puerto Rican children (RRadj = 5.14; 95% CI = 1.65-15.94) compared to white Puerto Rican children (RRadj = 1.50; 95% CI = 1.12-2.02).

conclusionsEarly childhood lead exposure is associated with poorer achievement on standardized reading and math tests in the 3rd grade for Mexican, Puerto Rican, and Other Hispanic children enrolled in Chicago Public Schools. While we did not see interactions between BLL and ISAT performance by Hispanic subgroup, the stronger association between BLL and math failure for Black Puerto Rican children is intriguing and warrants further study.

Indexed as

Educational MeasurementBlack or African AmericanBlack PeopleChicagoChildChild, PreschoolCohort StudiesEnvironmental ExposureFemaleHispanic or LatinoHumansIllinoisLeadMaleMental ProcessesMexican AmericansLeadHispanicslead poisoningschool performance

Identifiers

PMID27490560
PMCPMC4997460
OpenAlexW2481834359

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.