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Four population studies of asthma across at least two regions are described: European Community Respiratory Health Survey (ECRHS), the International Study of Wheezing in Infants (EISL), the International Study of Asthma and Allergies in Childhood (ISAAC) and the World Health Survey (WHS). Two of these (ISAAC and WHS) covered all the regions of the world; each using its own standardised questionnaire-based methodology with cross-sectional study design, suitable for large populations. EISL (2005 and 2012) and ISAAC (1996\u20131997 and 2002\u20132003) have undertaken a second cross-sectional population survey from which trends are available: EISL in three centres in two countries; ISAAC 106 centres in 56 countries (13\u201314\u2005year olds) and 66 centres in 37 countries (6\u20137\u2005year olds). Key results from these studies are presented. Unfortunately, there is no new worldwide data outside of EISL since 2003. Global Burden of Disease estimates of asthma prevalence have varied greatly. Recent reliable worldwide data on asthma prevalence and trends is needed; the Global Asthma Network Phase I will provide this in 2021.<\/jats:p>","DOI":"10.1183\/13993003.02094-2020","type":"journal-article","created":{"date-parts":[[2020,9,24]],"date-time":"2020-09-24T20:50:17Z","timestamp":1600980617000},"page":"2002094","update-policy":"https:\/\/doi.org\/10.1183\/ers-crossmark-policy","source":"Crossref","is-referenced-by-count":368,"title":["Trends in worldwide asthma prevalence"],"prefix":"10.1183","volume":"56","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-1768-3832","authenticated-orcid":false,"given":"M. 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