Table 1 Patient data
| Â | Characteristic | Peripheral blood study group | Synovial fluid study group |
|---|---|---|---|
Rheumatoid arthritis | Age [mean ± SD (range)] | 58 ± 12 (24–80) | 59 ± 15 (33–70) |
| Â | Female:male | 10:2 | 5:1 |
|  | White blood cells [mean ± SEM] | 6.4 × 106 ± 1.2 × 104/ml |  |
|  | C-reactive protein | 26 ± 6 (6–100) | 22 ± 7 (6–41) |
Psoriatic arthritis | Age [mean ± SD (range)] | 42 ± 14 (24–81) | 41 ± 15 (25–50) |
| Â | Female:male | 10:3 | 5:1 |
|  | White blood cells [mean ± SEM] | 8.0 × 106* ± 4.5 × 105/ml |  |
|  | C-reactive protein | 14 ± 4 (6–73) | 30 ± 15 (6–73) |
Osteoarthritis | Age [mean ± SD (range)] | 63 ± 12 (52–82) |  |
| Â | Female:male | 4:6 | Â |
|  | White blood cells [mean ± SEM] | 6.0 × 106 ± 8.9 × 105/ml |  |
|  | C-reactive protein | 10 ± 3 (6–14) |  |
Healthy | Age [mean ± SD (range)] | 44 ± 11 |  |
| Â | Female:male | 6:6 | Â |
|  | White blood cells [mean ± SEM] | 6.4 × 106 ± 4.7 × 105/ml |  |