Association of smoke-free laws with preterm or low birth weight deliveries-A multistate analysis.
OBJECTIVE
To assess the association between the change in statewide smoke-free laws and the rate of preterm or low birth weight delivery hospitalizations.


DATA SOURCE
2002-2013 Healthcare Cost and Utilization Project State Inpatient Databases.


STUDY DESIGN
Quasi-experimental difference-in-differences design. We used multivariate logistic models to estimate the association between the change in state smoke-free laws and preterm or low birth weight delivery hospitalizations. The analyses were also stratified by maternal race/ethnicity to examine the differential effects by racial/ethnic groups.


DATA COLLECTION/EXTRACTION METHODS
Delivery hospitalizations among women aged 15-49 years were extracted using the International Classification of Diseases, Ninth Revision, and Diagnosis-Related Group codes.


PRINCIPAL FINDINGS
Non-Hispanic black mothers had a higher rate of preterm or low birth weight delivery hospitalization than other racial/ethnic groups. Overall, there was no association between the change in smoke-free laws and preterm or low birth weight delivery rate. Among non-Hispanic black mothers, the change in statewide smoke-free laws was associated with a 0.9-1.9 percentage point (P < .05) reduction in preterm or low birth weight delivery rate beginning in the third year after the laws took effect. There was no association among non-Hispanic white mothers. A decline in the black-white disparity of 0.6-1.6 percentage points (P < .05) in preterm or low birth weight delivery rates was associated with the change in state smoke-free laws.


CONCLUSION
The change in state smoke-free laws was associated with a reduction in racial/ethnic disparities in preterm or low birth weight delivery hospitalizations in selected US states.
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D000293:Adolescent D000328:Adult D001741:African Americans D005006:Ethnicity D005260:Female D054625:Healthcare Disparities D006630:Hispanic or Latino D006801:Humans D007230:Infant, Low Birth Weight D007231:Infant, Newborn D011247:Pregnancy D011248:Pregnancy Complications D047928:Premature Birth D016540:Smoking Cessation D044465:Whites D055815:Young Adult
smoke-free laws low birth weight racial/ethnic disparity preterm delivery