*Reporting period is from April 1996 to March 2025. Data for 2023 and 2024 may be incomplete due to the 2-year algorithm to identify asthma, and numbers are subject to change.
†Ontario Marginalization Index expressed in quintiles used as a proxy measure of socioeconomic status.
‡Rural communities defined as those with fewer than 10,000 people.
Note: Asthma incidence and prevalence with missing LHIN, rurality, or PHU were excluded from the report.
PHU of Elgin and St. Thomas (2231) and Oxford Health Unit (2252) were merged in 2006 onwards at ICES, Ontario and now the PHU is named Southwestern Public Health (4913).
PHU of Huron (2239) and Perth (2254) were merged in 2006 onwards at ICES, Ontario and now the PHU is named Huron Perth Public Health (5183).
Source: This table uses statistics reported by the Ontario Asthma Surveillance Information System (OASIS) and data provided by ICES, Ontario.