Table 1.
Patient demographics and disease characteristics
| Parameter | Upper arm (n = 25) | Finger prick (n = 25) | Total (n = 50) |
|---|---|---|---|
| Age, years, mean ± SD | 56.7 ± 10.3 | 59.4 ± 13.9 | 58.0 ± 12.2 |
| Age, years, median (range) | 60.0 (36-72) | 64.0 (31-80) | 60.5 (31-80) |
| Female, n (%) | 22 (88.0) | 20 (80.0) | 42 (84.0) |
| BMI, kg/m2, mean ± SD | 26.7 ± 5.7 | 26.9 ± 5.5 | 26.8 ± 5.5 |
| RF (positive), n (%) | 21 (84.0) | 20 (80.0) | 41 (82.0) |
| ACPA (positive), n (%) | 20 (80.0) | 21 (84.0) | 41 (82.0) |
| CRP, mg/l, mean ± SD | 4.9 ± 13.0 | 6.8 ± 19.9 | 5.8 ± 16.7 |
| Previous use of self-sampling device, n (%) | 8 (32.0) | 4 (16.0) | 12 (48.0) |
| Swollen joint count, mean ± SD | 1.1 ± 1.6 | 1.1 ± 2.1 | 1.1 ± 1.8 |
| Tender joint count, mean ± SD | 2.2 ± 2.8 | 1.2 ± 2.2 | 1.7 ± 2.5 |
| PGA 0-10, mean ± SD | 2.6 ± 2.6 | 1.8 ± 2.6 | 2.2 ± 1.3 |
| DAS28-CRP, mean ± SD | 2.4 ± 1.2 | 2.0 ± 1.4 | 2.2 ± 2.6 |
ACPA anti-citrullinated protein antibodies, BMI body mass index, CRP C-reactive protein, DAS28 disease activity score, PGA patient global disease activity assessment, RF rheumatoid factor