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Second Trimester Sunlight and Asthma: Evidence from Two Independent Studies

Nils Wernerfelt, David Slusky and Richard Zeckhauser ()
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Nils Wernerfelt: Department of Economics, Massachusetts Institute of Technology

American Journal of Health Economics, 2017, vol. 3, issue 2, 227-253

Abstract: One in 12 Americans suffers from asthma, and its annual costs are estimated to exceed $50 billion. Yet the root causes of the disease remain unknown. A recent hypothesis posits that maternal vitamin D levels during pregnancy affect the probability the fetus later develops asthma. Employing two large-scale studies, we test this hypothesis using a natural experiment afforded by historical variation in sunlight, a major source of vitamin D. Specifically, holding the birth location and month fixed, we see how exogenous within-location variation in sunlight across birth years affects the probability of asthma onset. We show that this measurement of sunlight correlates with actual exposure, and consistent with preexisting results from the fetal development literature, we find substantial and highly significant evidence in both data sets that increased sunlight during the second trimester lowers the subsequent probability of asthma. Our results suggest policies designed to augment vitamin D levels in pregnant women, the large majority of whom are vitamin D insufficient, could be very cost effective and yield a substantial surplus.

Keywords: asthma; sunlight; vitamin D; natural experiment (search for similar items in EconPapers)
JEL-codes: I12 I18 J13 (search for similar items in EconPapers)
Date: 2017
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Journal Article: Second Trimester Sunlight and Asthma: Evidence from Two Independent Studies (2017) Downloads
Working Paper: Second Trimester Sunlight and Asthma: Evidence from Two Indpendent Studies (2014) Downloads
Working Paper: Second Trimester Sunlight and Asthma: Evidence from Two Independent Studies (2014) Downloads
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