Table 1.
Characteristics of participants. Summary values are shown as median (interquartile range)
| Rheumatoid arthritis | Psoriatic arthritis | Unclassified arthritis | Inflammatory arthralgia | p for difference between groups | |
|---|---|---|---|---|---|
| Number | 13 | 4 | 4 | 13 | |
| Sex | 10 female | 3 female | 1 female | 9 female | p = 0.27 |
| Age (years) | 52 (39–61.5) | 47 (29.75–57.5) | 69 (51.25–78.5) | 42 (35–57.5) | p = 0.13 |
| Tender joint count (out of 28) | 8 (4.5–12) | 5.5 (3.25–8.5) | 3.5 (2.25–5.5) | 3 (0–12) | p = 0.12 |
| Swollen joint count (out of 28) | 5 (1.5–5.5) | 3 (1.25–6.25) | 3 (1.5–5.25) | 0 | p < 0.001 |
| Patient global score (out of 100) | 49 (29–68.5) | 48.5 (29.75–82.25) | 19.5 (15.25–43.25) | 46 (13.5–60.5) | p = 0.38 |
| ESR (mm/h) | 18 (11–48.5) | 25.5 (12–33.75) | 22.5 (14.5–72.5) | 15 (8–20.5) | p = 0.28 |
| CRP (mg/l) | 9 (4.5–13.5) | 6.5 (1.5–28) | 4.5 (1.5–9) | 2 (1–7) | p = 0.22 |
| DAS28 | 4.61 (4.17–5.73) | 4.64 (4.13–5.26) | 4.1 (3.8–4.7) | 3.61 (2.18–4.70) | p = 0.016 |
| Rheumatoid factor positivity | Negative 6 | Negative 4 | Negative 4 | Negative 11 | p = 0.13 |
| Low 3 | Low 0 | ||||
| High 4 | High 2 | ||||
| Anti-CCP antibody positivity * | Negative 8 | Negative 3 | Negative 4 | Negative 8 | p = 0.092 |
| High 4 | Low 1 | High 5 |
*Anti-CCP antibody test was not performed in 1 RA patient