Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Number of patients treated or not with oral corticosteroids during the 3 periods (dark gray) p1 and p2: Number of patients with a severe asthma exacerbation; p3: Number of patients treated with oral corticosteroids and β2 agonist; (light gray) no treatment with oral corticosteroids, and β2 agonist during p1, p2, and p3. No time period effect (P = .09).
