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.
Symptom prevalence refers to the proportion of participants reporting a particular symptom on a given day (calculated as the number of participants reporting a particular symptom divided by the total number of participants completing a diary entry on a given day).
