[Skip to Content]
Access to paid content on this site is currently suspended due to excessive activity being detected from your IP address 34.236.145.124. Please contact the publisher to request reinstatement.
[Skip to Content Landing]
Original Investigation
October 2018

Effect of Residential Lead-Hazard Interventions on Childhood Blood Lead Concentrations and Neurobehavioral Outcomes: A Randomized Clinical Trial

Author Affiliations
  • 1Department of Epidemiology, Brown University, Providence, Rhode Island
  • 2Department of Pediatrics, Cincinnati Children’s Hospital Medical Center, Cincinnati, Ohio
  • 3Department of Environmental Health, University of Cincinnati College of Medicine, Cincinnati, Ohio
  • 4National Center for Healthy Housing, Chicago, Illinois
  • 5Department of Environmental and Occupational Health Sciences, University of Illinois at Chicago, Chicago
  • 6Centers for Disease Control and Prevention, Atlanta, Georgia
  • 7Division of Biostatistics and Epidemiology, Cincinnati Children’s Hospital Medical Center, University of Cincinnati College of Medicine, Cincinnati, Ohio
  • 8Department of Pediatrics, Cincinnati Children’s Hospital Medical Center, University of Cincinnati College of Medicine, Cincinnati, Ohio
  • 9Department of Dermatology, University of Pennsylvania, Philadelphia, Pennsylvania
  • 10Faculty of Health Sciences, Simon Fraser University, Burnaby, British Columbia, Canada
JAMA Pediatr. 2018;172(10):934-942. doi:10.1001/jamapediatrics.2018.2382
Key Points

Question  Can residential lead hazards be reduced to prevent childhood lead poisoning and associated neurobehavioral deficits?

Findings  In this randomized clinical trial of 355 pregnant women and their children, a comprehensive residential intervention reduced dust lead loadings and, among non-Hispanic black children, blood lead concentrations but did not substantively improve neurobehavioral outcomes.

Meaning  Reducing residential lead exposures and, among those at higher risk of lead poisoning, blood lead concentrations is possible without elevating childhood body lead burden.

Abstract

Importance  Childhood lead exposure is associated with neurobehavioral deficits. The effect of a residential lead hazard intervention on blood lead concentrations and neurobehavioral development remains unknown.

Objective  To determine whether a comprehensive residential lead-exposure reduction intervention completed during pregnancy could decrease residential dust lead loadings, prevent elevated blood lead concentrations, and improve childhood neurobehavioral outcomes.

Design, Setting, and Participants  This longitudinal, community-based randomized clinical trial of pregnant women and their children, the Health Outcomes and Measures of the Environment (HOME) Study, was conducted between March 1, 2003, and January 31, 2006. Pregnant women attending 1 of 9 prenatal care clinics affiliated with 3 hospitals in the Cincinnati, Ohio, metropolitan area were recruited. Of the 1263 eligible women, 468 (37.0%) agreed to participate and 355 women (75.8%) were randomized in this intention-to-treat analysis. Participants were randomly assigned to receive 1 of 2 interventions designed to reduce residential lead or injury hazards. Follow-up on children took place at 1, 2, 3, 4, 5, and 8 years of age. Data analysis was performed from September 2, 2017, to May 6, 2018.

Main Outcomes and Measures  Residential dust lead loadings were measured at baseline and when children were 1 and 2 years of age. At 1, 2, 3, 4, 5, and 8 years of age, the children’s blood lead concentrations as well as behavior, cognition, and executive functions were assessed.

Results  Of the 355 women randomized, 174 (49.0%) were assigned to the intervention group (mean [SD] age at delivery, 30.1 (5.5) years; 119 [68.3%] self-identified as non-Hispanic white) and 181 (50.9%) to the control group (mean [SD] age at delivery, 29.2 [5.7] years; 123 [67.9%] self-identified as non-Hispanic white). The intervention reduced the dust lead loadings for the floor (24%; 95% CI, –43% to 1%), windowsill (40%; 95% CI, –60% to –11%), and window trough (47%; 95% CI, –68% to –10%) surfaces. The intervention did not statistically significantly reduce childhood blood lead concentrations (–6%; 95% CI, –17% to 6%; P = .29). Neurobehavioral test scores were not statistically different between children in the intervention group than those in the control group except for a reduction in anxiety scores in the intervention group (β = –1.6; 95% CI, –3.2 to –0.1; P = .04).

Conclusions and Relevance  Residential lead exposures, as well as blood lead concentrations in non-Hispanic black children, were reduced through a comprehensive lead-hazard intervention without elevating the lead body burden. However, this decrease did not result in substantive neurobehavioral improvements in children.

Trial Registration  ClinicalTrials.gov identifier: NCT00129324

×