Ambient Heat and Sudden Infant Death: A Case-Crossover Study Spanning 30 Years in Montreal, Canada

Environmental Health Perspectives
Nathalie AugerTom Kosatsky

Abstract

Climate change may lead to more severe and extreme heat waves in the future, but its potential impact on sudden infant death-a leading cause of infant mortality-is unclear. We sought to determine whether risk of sudden infant death syndrome (SIDS) is elevated during hot weather. We undertook a case-crossover analysis of all sudden infant deaths during warm periods in metropolitan Montreal, Quebec, Canada, from 1981 through 2010. Our analysis included a total of 196 certified cases of SIDS, including 89 deaths at 1-2 months of age, and 94 at 3-12 months. We estimated associations between maximum outdoor temperatures and SIDS by comparing outdoor temperatures on the day of or day before a SIDS event with temperatures on control days during the same month, using cubic splines to model temperature and adjusting for relative humidity. Maximum daily temperatures of ≥ 29°C on the same day were associated with 2.78 times greater odds of sudden infant death relative to 20°C (95% CI: 1.64, 4.70). The likelihood of sudden death increased steadily with higher temperature. Associations were stronger for infants 3-12 months of age than for infants 1-2 months of age, with odds ratios of 3.90 (95% CI: 1.87, 8.13) and 1.73 (95% CI: 0.80, 3.73),...Continue Reading

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Dec 24, 2015·International Journal of Environmental Research and Public Health·Hung Chak HoWei Huang
Jul 15, 2015·Paediatric and Perinatal Epidemiology·Rupa BasuRachel Broadwin
Jul 2, 2015·Environmental Health Perspectives·Carrie Arnold
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Mar 14, 2021·The Lancet. Planetary Health·Daniel HelldénTobias Alfvén

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