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.
Characteristics of 813 patients with rheumatoid arthritis (RA)
| Characteristics | Mean (± SD) or n (%) |
|---|---|
| Age at RA incidence, years | 55.9 (± 15.7) |
| Female | 556 (68) |
| Length of follow-up, years | 12.0 (± 7.2) |
| Smoking Status at RA incidence | |
| Never | 364 (45) |
| Current | 178 (22) |
| Former | 271 (33) |
| Rheumatoid nodules | 267 (33) |
| ESR at RA incidence, mm/1hr | 24.8 (± 20.5) |
| Rheumatoid factor positive | 537 (66) |
ESR = Erythrocyte sedimentation rate (Westergren); SD = standard deviation
