Characteristics of fibromyalgia and RA patients. Data are means (SD) unless otherwise indicated.
| Variable | RA All (N = 5884) | RA FM+ (N = 1223) | RA FM− (N = 4651) | FM All (N = 808) | FM Criteria (+) (N = 466) |
|---|---|---|---|---|---|
| HRQOL VAS (0–10) | 6.6 (2.1) | 5.9 (1.8) | 7.3 (2.0) | 6.0 (2.0) | 5.3 (1.9) |
| Global severity (0–10) | 3.5 (2.4) | 5.7 (2.0) | 2.9 (2.1) | 4.9 (2.4) | 5.8 (2.1) |
| Fatigue (0–10) | 3.9 (3.0) | 7.0 (2.1) | 3.0 (2.6) | 5.9 (2.8) | 7.1 (2.1) |
| Pain (0–10) | 3.4 (2.7) | 6.0 (2.3) | 2.7 (2.3) | 5.4 (2.6) | 6.4 (2.1) |
| Mood (0–10) | 2.4 (1.8) | 3.8 (2.0) | 2.1 (1.5) | 3.4 (2.1) | 4.1 (2.1) |
| HAQ (0–3) | 1.0 (0.7) | 1.6 (0.6) | 0.8 (0.7) | 1.1 (0.7) | 1.3 (0.6) |
| Sleep disturbance (0–10) | 3.6 (3.0) | 6.2 (2.7) | 2.9 (2.7) | 5.5 (3.1) | 6.5 (2.6) |
| Symptom count (0–37) | 7.2 (5.6) | 13.6 (5.7) | 5.5 (4.2) | 12.9 (6.4) | 16.1 (5.7) |
| Widespread pain index | 5.3 (5.0) | 11.9 (4.3) | 3.5 (3.4) | 9.6 (5.5) | 12.7 (4.3) |
| Stiffness (AM), % | |||||
| No AM stiffness | 18.6 | 3.0 | 22.8 | 5.2 | 2.2 |
| Less than 30 min | 37.6 | 17.4 | 43.0 | 24.6 | 15.2 |
| 30 min to 1 h | 22.4 | 30.4 | 20.3 | 30.2 | 31.1 |
| 1–2 h | 11.0 | 20.4 | 8.5 | 20.2 | 24.5 |
| 2–4 h | 5.5 | 14.4 | 3.1 | 7.9 | 11.8 |
| 4–8 h | 1.9 | 5.8 | 0.9 | 3.7 | 4.7 |
| >8 h | 3.0 | 8.7 | 1.5 | 8.2 | 10.5 |
| Cognitive symptoms, % | |||||
| None | 47.4 | 9.1 | 57.5 | 17.1 | 5.4 |
| Mild | 37.8 | 45.5 | 35.8 | 42.3 | 35.4 |
| Moderate | 11.9 | 33.7 | 6.0 | 31.9 | 44.6 |
| Severe | 3.0 | 11.7 | 0.7 | 8.7 | 14.6 |
| SF-36 physical component summary | 38.2 (11.3) | 29.1 (7.8) | 40.6 (10.9) | 33.4 (9.9) | 29.9 (8.0) |