Table 2.
Characteristics of patients with rheumatoid arthritis, 1998–2009
| Characteristic | Patients with chart review, % (n = 108) | Patients with computerized data, % (n = 28,601) |
|---|---|---|
| Sexa | ||
| Men | 19 | 26 |
| Women | 81 | 74 |
| Age group, yearsb | ||
| 18–39 | 18 | 7 |
| 40–49 | 12 | 11 |
| 50–59 | 24 | 19 |
| 60–69 | 23 | 22 |
| 70–89 | 23 | 41 |
| Race/ethnicity | ||
| White | 53 | 57 |
| Hispanic | 17 | 16 |
| Black | 10 | 8 |
| Asian | 12 | 8 |
| Unknown/other | 8 | 11 |
| Antibody positivity | ||
| Rheumatoid factor positive | 69 | — |
| Anticyclic citrullinated peptide antibody positive | 24 | — |
| Radiographic evidence | ||
| Juxta-articular osteopenia | 15 | — |
| Soft-tissue/fusiform swelling | 4 | — |
| Joint space narrow | 17 | — |
| Periarticular erosions | 14 | — |
| Subluxations | 7 | — |
| Comorbid gout | 6 | — |
| Joint involvement | ||
| Shoulder, elbows | 12 | — |
| Knees | 20 | — |
| Ankles | 18 | — |
| Metacarpophalangeal (MPT) joints | 27 | — |
| Proximal interphalangeal joints | 32 | — |
| Second through fifth MPT joints | 17 | — |
| Wrist | 37 | — |
| Hands | 15 | — |
| Feet | 6 | — |
| Not recorded | 27 | — |
| Number of involved small joints | ||
| 0–1 | 9 | — |
| 2 | 16 | — |
| 3–10 | 42 | — |
| Not recorded | 33 | — |
| Disease duration, years | ||
| 0–4 | 25 | — |
| 5–9 | 14 | — |
| 10–19 | 31 | — |
| ≥ 20 | 23 | — |
| Unknown | 6 | — |
a
p = 0.16.
b
p < 0.01.
— = not available.