Fig. 1. The trend of yearly SABA use in overall asthmatic patients between 2002 and 2012. (A) Percentage of patient groups categorized by the number of prescribed SABA canisters per year. (B) Percentage of patients with SABA overuse. (C) Percentage of SABA overuse according to age group among the total patients with asthma. SABA overuse was defined as a prescription of at least 3 SABA canisters (200 doses/canister) per year.
SABA, short-acting β2 agonist.