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.
Figure 1 Percentage of responders according to IgA rheumatoid factor (RF) levels at baseline. The patients were stratified into three different groups: IgA rheumatoid factor negative (level <20 U/ml), IgA rheumatoid factor low (level between 20 and 100 U/ml) and IgA rheumatoid factor high (level >100 U/ml). Pt, Patient
