Ambient temperature and added heat wave effects on hospitalizations in California from 1999 to 2009

TitleAmbient temperature and added heat wave effects on hospitalizations in California from 1999 to 2009
Publication TypeJournal Article
Year of Publication2018
AuthorsSherbakov T., Malig B., Guirguis K., Gershunov A, Basu R.
JournalEnvironmental Research
Date Published2018/01
Type of ArticleArticle
ISBN Number0013-9351
Accession NumberWOS:000417548600010
Keywordsadmissions; Appendicitis; Cardiovascular diseases; china; Diabetes mellitus; disorders; Effect modifiers; Enteritis; european cities; Extreme heat; health; heat; Heat-related illness; Hospitalization; impact; Mental; morbidity; mortality; Respiratory tract diseases; risk; stroke; temperature; united-states; waves

Investigators have examined how heat waves or incremental changes in temperature affect health outcomes, but few have examined both simultaneously. We utilized distributed lag nonlinear models (DLNM) to explore temperature associations and evaluate possible added heat wave effects on hospitalizations in 16 climate zones throughout California from May through October 1999-2009. We define heat waves as a period when daily mean temperatures were above the zone- and month-specific 95th percentile for at least two consecutive days. DLNMs were used to estimate climate zone-specific non-linear temperature and heat wave effects, which were then combined using random effects meta-analysis to produce an overall estimate for each. With higher temperatures, admissions for acute renal failure, appendicitis, dehydration, ischemic stroke, mental health, noninfectious enteritis, and primary diabetes were significantly increased, with added effects from heat waves observed for acute renal failure and dehydration. Higher temperatures also predicted statistically significant decreases in hypertension admissions, respiratory admissions, and respiratory diseases with secondary diagnoses of diabetes, though heat waves independently predicted an added increase in risk for both respiratory types. Our findings provide evidence that both heat wave and temperature exposures can exert effects independently.

Short TitleEnviron Res
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