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.
Differences in data capture across specifications
| Element | Source category | Reference category |
|---|---|---|
| Hospitalized ever, prednisone use ever | Severity | History of exacerbations |
| Beta-blocker | Risk factor | Medication history |
| Second hand smoke exposure | Risk factor | Smoking history |
| Sinusitis | Risk factor | Comorbidity |
| Rhinitis | Allergy history | Comorbidities |
