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.
Composite symptom grade definitions.
| Symptom grade | Severity | Frequency | Interference |
| Grade 1 | Mild | Rarely | N/Aa |
| Grade 2 | Moderate | Occasionally | Somewhat |
| Grade 3 | Severe | Frequently | Quite a bit |
| Grade 4 | Very severe | Almost constantly | Very much |
aN/A: not applicable.
