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Modeling the impact of exposure reductions using multi-stressor epidemiology, exposure models, and synthetic microdata: an application to birthweight in two environmental justice communities

Abstract

Background

Many vulnerable populations experience elevated exposures to environmental and social stressors, with deleterious effects on health. Multi-stressor epidemiological models can be used to assess benefits of exposure reductions. However, requisite individual-level risk factor data are often unavailable at adequate spatial resolution.

Objective

To leverage public data and novel simulation methods to estimate birthweight changes following simulated environmental interventions in two environmental justice communities in Massachusetts, USA.

Methods

We gathered risk factor data from public sources (US Census, Behavioral Risk Factor Surveillance System, and Massachusetts Department of Health). We then created synthetic individual-level data sets using combinatorial optimization, and probabilistic and logistic modeling. Finally, we used coefficients from a multi-stressor epidemiological model to estimate birthweight and birthweight improvement associated with simulated environmental interventions.

Results

We created geographically resolved synthetic microdata. Mothers with the lowest predicted birthweight were those identifying as Black or Hispanic, with parity > 1, utilization of government prenatal support, and lower educational attainment. Birthweight improvements following greenness and temperature improvements were similar for all high-risk groups and were larger than benefits from smoking cessation.

Significance

Absent private health data, this methodology allows for assessment of cumulative risk and health inequities, and comparison of individual-level impacts of localized health interventions.

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Fig. 1: Schematic of modeling methods used to create a synthetic population of mothers and newborns in Chelsea and Dorchester, Massachusetts.
Fig. 2: Annual average neighborhood-level economic and environmental exposures in Chelsea and Dorchester.
Fig. 3: Distributions of predicted birthweight (grams), separated by common risk factors.
Fig. 4: Census tracts for Chelsea and Dorchester with the number (#) of newborns in the lowest tertile of synthetic birthweight.
Fig. 5: Change in birthweight following environmental exposure improvements and smoking cessation for different high-risk population groups.

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Acknowledgements

The authors appreciate feedback from the Center for Research on Social Stressors in Housing across the life course (CRESSH) advisory board, and acknowledge Fei Carnes for data processing.

Funding

This research is part of the Center for Research on Social Stressors in Housing across the life course (CRESSH); NIH/NIHMD Grant P50 MD010428 and USEPA RD83615601. The contents are solely the responsibility of the grantee and do not necessarily represent the official views of the USEPA. Furthermore, USEPA does not endorse the purchase of any commercial products or services mentioned in the publication.

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Correspondence to Chad W. Milando.

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Milando, C.W., Yitshak-Sade, M., Zanobetti, A. et al. Modeling the impact of exposure reductions using multi-stressor epidemiology, exposure models, and synthetic microdata: an application to birthweight in two environmental justice communities. J Expo Sci Environ Epidemiol 31, 442–453 (2021). https://doi.org/10.1038/s41370-021-00318-4

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