Acute associations between heatwaves and preterm and early-term birth in 50 US metropolitan areas: a matched case-control study

Autor:	Matthew J. Strickland, Andrew J. Newman, Joshua V. Garn, Mengjiao Huang, Lyndsey A. Darrow, Yan Liu, Heather A. Holmes, Megan Richards, Howard H. Chang, Joshua L. Warren
Jazyk:	angličtina
Rok vydání:	2021
Předmět:	Adult Male medicine.medical_specialty Percentile Hot Temperature Health Toxicology and Mutagenesis 010501 environmental sciences 01 natural sciences Odds 03 medical and health sciences Young Adult 0302 clinical medicine Medicine Humans Climate change 030212 general & internal medicine Cities Early-term birth 0105 earth and related environmental sciences business.industry Singleton Public health Research Public Health Environmental and Occupational Health Case-control study Infant Newborn Heatwave Preterm birth Odds ratio Industrial medicine. Industrial hygiene United States RC963-969 Case-Control Studies Gestation Marital status Premature Birth Female Public aspects of medicine RA1-1270 business Demography
Zdroj:	Environmental Health, Vol 20, Iss 1, Pp 1-14 (2021) Environmental Health
Popis:	Background The effect of heatwaves on adverse birth outcomes is not well understood and may vary by how heatwaves are defined. The study aims to examine acute associations between various heatwave definitions and preterm and early-term birth. Methods Using national vital records from 50 metropolitan statistical areas (MSAs) between 1982 and 1988, singleton preterm (th percentile of MSA-specific temperature metrics, or the 85th percentile of positive excessive heat factor (EHF) were created. Odds ratios (OR) for heatwave exposures in the week preceding birth (or corresponding gestational week for controls) were estimated using conditional logistic regression adjusting for maternal age, marital status, and seasonality. Effect modification by maternal education, age, race/ethnicity, child sex, and region was assessed. Results There were 615,329 preterm and 1,005,576 early-term case-control pairs in the analyses. For most definitions, exposure to heatwaves in the week before delivery was consistently associated with increased odds of early-term birth. Exposure to more high heat days and more degrees above the threshold yielded higher magnitude ORs. For exposure to 3 or more days over the 97.5th percentile of mean temperature in the past week compared to zero days, the OR was 1.027 for early-term birth (95%CI: 1.014, 1.039). Although we generally found null associations when assessing various heatwave definitions and preterm birth, ORs for both preterm and early-term birth were greater in magnitude among Hispanic and non-Hispanic black mothers. Conclusion Although associations varied across metrics and heatwave definitions, heatwaves were more consistently associated with early-term birth than with preterm birth. This study’s findings may have implications for prevention programs targeting vulnerable subgroups as climate change progresses.
Databáze:	OpenAIRE
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