The relationship between extreme temperature and mortality in the United States varies by location, according to a study from researchers at the Johns Hopkins Bloomberg School of Public Health. Excessive heat is more likely to increase mortality risk in the North, while excessive cold is more likely to increase mortality risk in the South. The study appears in the January 1, 2001 issue of the American Journal of Epidemiology.
"Historically, we know that episodes of extremely hot or cold temperatures increase mortality. Global warming and other weather phenomena, such as El Nino, have warranted the need for further investigation into the weather-mortality relation," says lead author Frank Curriero, PhD, an assistant scientist in the Department of Biostatistics at the Johns Hopkins Bloomberg School of Public Health. "We explored this relation in cities along the eastern United States, to further characterize the effects of temperature as varied by latitudes as well as other factors particular to a specific city or area."