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# Associations between Residential Proximity to Oil and Gas Drilling and Term Birth Weight and Small-for-Gestational-Age Infants in Texas: A Difference-in-Differences Analysis

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Environmental Health Perspectives

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### Abstract

##### Background:

Oil and natural gas extraction may produce environmental pollution at levels that affect reproductive health of nearby populations. Available studies have primarily focused on unconventional gas drilling and have not accounted for local population changes that can coincide with drilling activity.

##### Objective:

Our study sought to examine associations between residential proximity to oil and gas drilling and adverse term birth outcomes using a difference-in-differences study design.

##### Methods:

We created a retrospective population-based term birth cohort in Texas between 1996 and 2009 composed of mother–infant dyads ( $n = 2,598,025$ ) living $< 10 km$ from an oil or gas site. We implemented a difference-in-differences approach to estimate associations between drilling activities and infant health: term birth weight and term small for gestational age (SGA). Using linear and logistic regression, we modeled interactions between births before (unexposed) or during (exposed) drilling activity and residential proximity near (0–1, 1–2, or $2 – 3 km$ ) or far ( $3 – 10 km$ ) from an active or future drilling site, adjusting for individual- and neighborhood-level characteristics.

##### Results:

The adjusted mean difference in term birth weight for mothers living 0–1 vs. $3 – 10 km$ from a current or future drilling site was $– 7.3 g$ [95% confidence interval (CI): $– 11.6$ , $– 3.0$ ] for births during active vs. future drilling. The corresponding adjusted odds ratio for SGA was 1.02 (95% CI: 0.98, 1.06). Negative associations with term birth weight were observed for the 1–2 and $2 – 3 km$ near groups, and no consistent differences were identified by type of drilling activity. Larger, though imprecise, adverse associations were found for infants born to Hispanic women, women with the lowest educational attainment, and women living in cities.

##### Conclusions:

Residing near oil and gas drilling sites during pregnancy was associated with a small reduction in term birth weight but not SGA, with some evidence of environmental injustices. Additional work is needed to investigate specific drilling-related exposures that might explain these associations. https://doi.org/10.1289/EHP7678

### Most cited references58

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### Ambient air pollution, birth weight and preterm birth: a systematic review and meta-analysis.

(2012)
Low birth weight and preterm birth have a substantial public health impact. Studies examining their association with outdoor air pollution were identified using searches of bibliographic databases and reference lists of relevant papers. Pooled estimates of effect were calculated, heterogeneity was quantified, meta-regression was conducted and publication bias was examined. Sixty-two studies met the inclusion criteria. The majority of studies reported reduced birth weight and increased odds of low birth weight in relation to exposure to carbon monoxide (CO), nitrogen dioxide (NO(2)) and particulate matter less than 10 and 2.5 microns (PM(10) and PM(2.5)). Effect estimates based on entire pregnancy exposure were generally largest. Pooled estimates of decrease in birth weight ranged from 11.4 g (95% confidence interval -6.9-29.7) per 1 ppm CO to 28.1g (11.5-44.8) per 20 ppb NO(2), and pooled odds ratios for low birth weight ranged from 1.05 (0.99-1.12) per 10 μg/m(3) PM(2.5) to 1.10 (1.05-1.15) per 20 μg/m(3) PM(10) based on entire pregnancy exposure. Fewer effect estimates were available for preterm birth and results were mixed. Pooled odds ratios based on 3rd trimester exposures were generally most precise, ranging from 1.04 (1.02-1.06) per 1 ppm CO to 1.06 (1.03-1.11) per 20 μg/m(3) PM(10). Results were less consistent for ozone and sulfur dioxide for all outcomes. Heterogeneity between studies varied widely between pollutants and outcomes, and meta-regression suggested that heterogeneity could be partially explained by methodological differences between studies. While there is a large evidence base which is indicative of associations between CO, NO(2), PM and pregnancy outcome, variation in effects by exposure period and sources of heterogeneity between studies should be further explored. Crown Copyright © 2012. Published by Elsevier Inc. All rights reserved.
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### Semiparametric Difference-in-Differences Estimators

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Is Open Access

### A Fifteen Year Record of Global Natural Gas Flaring Derived from Satellite Data

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### Author and article information

###### Journal
Environ Health Perspect
Environ Health Perspect
EHP
Environmental Health Perspectives
Environmental Health Perspectives
0091-6765
1552-9924
21 July 2021
July 2021
: 129
: 7
###### Affiliations
[ 1 ]School of Biological and Population Health Sciences, College of Public Health and Human Sciences, Oregon State University , Corvallis, Oregon, USA
[ 2 ]Department of Epidemiology, School of Public Health, Boston University , Boston, Massachusetts, USA
[ 3 ]Department of Public Health Sciences, School of Medicine and Dentistry, University of Rochester , Rochester, New York, USA
[ 4 ]Rochester Data Science Consortium , Rochester, New York, USA
###### Author notes
Address correspondence to Mary Willis, 160 SW 26th St., Corvallis, Oregon 97331 USA. Email: mary.willis@ 123456oregonstate.edu
###### Article
EHP7678
10.1289/EHP7678
8293911
34287013
3c73f344-46db-4f0f-9487-53c84c3be8fe

EHP is an open-access journal published with support from the National Institute of Environmental Health Sciences, National Institutes of Health. All content is public domain unless otherwise noted.

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Research

Public health