Are residents of mountain‐top mining counties more likely to have infants with birth defects? The west virginia experience

Steven H. Lamm · Shayhan A. Robbins · Elisabeth K. Dissen · Rusan Chen · Manning Feinleib

18 citations0/0 files storedBirth Defects Research Part A Clinical and Molecular Teratology

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Appalachian Studies and Mathematics Maternal and Neonatal Healthcare Prenatal Substance Exposure Effects

Abstract

BACKGROUND: Pooled 1996 to 2003 birth certificate data for four central states in Appalachia indicated higher rates of infants with birth defects born to residents of counties with mountain-top mining (MTM) than born to residents of non-mining-counties (Ahern 2011). However, those analyses did not consider sources of uncertainty such as unbalanced distributions or quality of data. Quality issues have been a continuing problem with birth certificate analyses. We used 1990 to 2009 live birth certificate data for West Virginia to reassess this hypothesis. METHODS: Forty-four hospitals contributed 98% of the MTM-county births and 95% of the non-mining-county births, of which six had more than 1000 births from both MTM and nonmining counties. Adjusted and stratified prevalence rate ratios (PRRs) were computed both by using Poisson regression and Mantel-Haenszel analysis. RESULTS: Unbalanced distribution of hospital births was observed by mining groups. The prevalence rate of infants with reported birth defects, higher in MTM-counties (0.021) than in non-mining-counties (0.015), yielded a significant crude PRR (cPRR = 1.43; 95% confidence interval [CI] = 1.36-1.52) but a nonsignificant hospital-adjusted PRR (adjPRR = 1.08; 95% CI = 0.97-1.20; p = 0.16) for the 44 hospitals. So did the six hospital data analysis ([cPRR = 2.39; 95% CI = 2.15-2.65] and [adjPRR = 1.01; 95% CI, 0.89-1.14; p = 0.87]). CONCLUSION: No increased risk of birth defects was observed for births from MTM-counties after adjustment for, or stratification by, hospital of birth. These results have consistently demonstrated that the reported association between birth defect rates and MTM coal mining was a consequence of data heterogeneity. The data do not demonstrate evidence of a "Mountain-top Mining" effect on the prevalence of infants with reported birth defects in WV.

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References

2011The association between mountaintop mining and birth defects among live births in central Appalachia, 1996–2003 2012Mortality Disparities in Appalachia

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2017Disparate impacts of coal mining and reclamation concerns for West Virginia and central Appalachia 2020Human Health in Coalfield Communities of Appalachia 2020Surface mining and low birth weight in central appalachia

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