Abstract:
:Asthma and lead poisoning are prevalent among urban children in the United States. Lead exposure may be associated with excessive production of immunoglobulin E, possibly increasing asthma risk and contributing to racial disparities. The objective of this study was to examine racial differences in the association of blood lead level (BLL) to risk of developing asthma. We established and followed a cohort prospectively to determine asthma onset, using patient encounters and drug claims obtained from hospital databases. Participants were managed care enrollees with BLL measured and documented at 1-3 years of age. We used multiple variable analysis techniques to determine the relationship of BLL to period prevalent and incident asthma. Of the 4,634 children screened for lead from 1995 through 1998, 69.5% were African American, 50.5% were male, and mean age was 1.2 years. Among African Americans, BLL > or = 5 and BLL > or = 10 microg/dL were not associated with asthma. The association of BLL > or = 5 microg/dL with asthma among Caucasians was slightly elevated, but not significant [adjusted hazard ratio (adjHR) = 1.4; 95% confidence interval (CI), 0.7-2.9; p = 0.40]. Despite the small number of Caucasians with high BLL, the adjHR increased to 2.7 (95% CI, 0.9-8.1; p = 0.09) when more stringent criteria for asthma were used. When compared with Caucasians with BLL < 5 microg/dL, African Americans were at a significantly increased risk of asthma regardless of BLL (adjHR = 1.4-3.0). We conclude that an effect of BLL on risk of asthma for African Americans was not observed. These results demonstrate the need for further exploration of the complex interrelationships between race, asthma phenotype, genetic susceptibilities, and socioenvironmental exposures, including lead.
journal_name
Environ Health Perspectjournal_title
Environmental health perspectivesauthors
Joseph CL,Havstad S,Ownby DR,Peterson EL,Maliarik M,McCabe MJ Jr,Barone C,Johnson CCdoi
10.1289/ehp.7453subject
Has Abstractpub_date
2005-07-01 00:00:00pages
900-4issue
7eissn
0091-6765issn
1552-9924journal_volume
113pub_type
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journal_title:Environmental health perspectives
pub_type: 杂志文章
doi:10.1289/ehp.782351
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更新日期:2008-07-01 00:00:00
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更新日期:2002-10-01 00:00:00
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更新日期:2006-09-01 00:00:00
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更新日期:1997-09-01 00:00:00
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pub_type: 杂志文章,评审
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journal_title:Environmental health perspectives
pub_type: 杂志文章,评审
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更新日期:1998-10-01 00:00:00
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更新日期:2000-09-01 00:00:00
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journal_title:Environmental health perspectives
pub_type: 杂志文章
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更新日期:1998-12-01 00:00:00
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更新日期:1975-12-01 00:00:00
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pub_type: 杂志文章
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更新日期:2011-11-01 00:00:00
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pub_type: 杂志文章
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更新日期:2014-03-01 00:00:00
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journal_title:Environmental health perspectives
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更新日期:1985-10-01 00:00:00
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更新日期:2011-06-01 00:00:00
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journal_title:Environmental health perspectives
pub_type: 杂志文章
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更新日期:1977-08-01 00:00:00
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更新日期:2009-09-01 00:00:00
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pub_type: 杂志文章,评审
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更新日期:1980-04-01 00:00:00
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journal_title:Environmental health perspectives
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更新日期:1997-09-01 00:00:00