Cited by 80Climate Change and Health ImpactsNeuroscience of respiration and sleepEffects of Environmental Stressors on Livestock

Ambient heat and sudden infant death: a case-crossover study spanning 30 years in Montreal, Canada

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Auger, Nathalie, Fraser, William D., Smargiassi, Audrey, Kosatsky, Tom·2015·Environmental Health Perspectives

Abstract

BACKGROUND: 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. OBJECTIVES: We sought to determine whether risk of sudden infant death syndrome (SIDS) is elevated during hot weather. METHODS: 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. RESULTS: 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), respectively, for 29°C compared with 20°C on the day of the event. CONCLUSIONS: High ambient temperature may be a novel risk factor for SIDS, especially at ≥ 3 months of age. Climate change and the higher temperatures that result may account for a potentially greater proportion of sudden infant deaths in the future.

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  1. Buckley JP Samet JM Richardson DB 2014 Does air pollution confound studies of temperature? Epidemiology 25 242 245 24487206

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Authors
Auger, N., Fraser, W. D., Smargiassi, A., & Kosatsky, T.
Affiliations
  • Institut National de Santé Publique du Québec (CA)
  • Université de Sherbrooke (CA)
  • BC Centre for Disease Control (CA)
Corresponding author
Auger, Nathalie
Venue
Environmental Health Perspectives
Published
2015-03-06
Volume
123
Issue
7
Pages
712-716
ISSN
  • 0091-6765 (ISSN-L)
  • 1552-9924
OpenAlex
W2055704757
Cited by
80
References
52
Citations by year
2026: 6 · 2025: 6 · 2024: 9 · 2023: 6 · 2022: 15 · 2021: 10 · 2020: 3 · 2019: 5 · 2018: 3 · 2017: 12 · 2016: 2 · 2015: 3
FWCI
4.18
Type
journal article
Language
en
Open access
Locations
  • Environmental Health Perspectives (publishedVersion, public-domain)
  • Europe PMC (PubMed Central) (publishedVersion, public-domain)
  • PubMed Central (publishedVersion, public-domain)
  • PubMed (publishedVersion)
Topics
  • Physical Sciences › Environmental Science › Health, Toxicology and Mutagenesis › Climate Change and Health Impacts
  • Life Sciences › Neuroscience › Endocrine and Autonomic Systems › Neuroscience of respiration and sleep
  • Life Sciences › Agricultural and Biological Sciences › Animal Science and Zoology › Effects of Environmental Stressors on Livestock
Keywords
sudden infant death syndrome, ambient heat, heat waves, infant mortality, climate change, infant age, relative humidity, Montreal
MeSH terms
Age Factors, Cities, Female, Hot Temperature, Humans, Infant, Infant Mortality, Male, Quebec, Risk Factors, Sudden Infant Death, Logistic Models, Odds Ratio, Cross-Over Studies

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