Annual incidence of primary asthma outcomes (acute asthma exacerbation and acute status asthmaticus).

<p>Annual incidence of AAE (A) and ASA (B) expressed per 1,000 children. Red bars represent 1 y prior to AT in AT+ children or the first year of follow-up in AT− children; green bars represent 1 y after AT or the second year of follow-up. The difference in annual incidence of AAE (C) and ASA (D) is calculated by subtracting the incidence during 1 y pre-AT (or first year of follow-up in AT− children) from the incidence during 1 y post-AT (or second year of follow-up in AT− children). Black circles represent the AT+ group, and white squares represent the AT− group. All error bars represent the 95th percentile confidence intervals for a sample proportion.