Extreme weather and asthma: a systematic review and meta-analysis.

"Conflict of interest: All authors have nothing to disclose."

"Support statement: This study was funded by the Ministry of Science and Technology of Taiwan (MOST 109-2314-B-038-093-MY3 and 111-2314-B-038-079). Funding information for this article has been deposited with the Crossref Funder Registry."

"This systematic review and meta-analysis followed protocols of the Preferred Reporting Items for Systematic Reviews and Meta-Analyses []. This study also followed the Meta-analysis of Observational Studies in Epidemiology checklist []. The study protocol was registered at PROSPERO (registration ID CRD42022370081) before beginning the study. The full checklist and protocol for this study are provided in the supplementary materials. The PubMed, EMBASE, Web of Science and ProQuest databases were searched up to 20 October 2022. Our study had no restriction of date, but it was limited to English-language articles. The search strategy focused on locating studies with estimated coefficients linking extreme weather events to the following asthma-related outcomes: hospital admissions, ED visits, outpatient visits, asthma mortality, asthma symptoms and asthma diagnoses. A combination of the following terms were used to search keywords, titles and abstracts: “asthma”, “wheeze”, “wheezing”, “respiratory allergy”, “meteorology”, “climate change”, “climate”, “climat”, “extreme weather”, “extreme weather event”, “extreme climate event”, “ice storm”, “blizzard”, “dust storm”, “hail”, “lightning”, “tornado”, “flood”, “hurricane”, “cold spell” and “heat wave”. Full detailed strategies for each database are shown in supplementary table 1."