Laboratory findings among the studied groups of patients.
| Laboratory finding | Group 1 (UA) n = 25 | Group 2 (RA) n = 15 | Group 3 (SpA) n = 15 |
|---|---|---|---|
| ESR, mm/h* | 46.5 ± 14.1 | 55.1 ± 12.3 | 45.6 ± 9.1 |
| CRP, mg/dl* | 2.6 ± 1.2 | 3.6 ± 1.2 | 2.4 ± 0.8 |
| Mean RF titer* | 11.3 ± 24.6 | 109.7 ± 129.7 | NA |
| Mean anti-CCP titer* | 70.3 ± 97.8 | 275.2 ± 136.4 | NA |
| RF | |||
| Positive | 4/25 | 10/15 | NA |
| Negative | 21/25 | 5/15 | NA |
| Anti-CCP2 | |||
| Positive | 13/25 | 15/15 | NA |
| Negative | 12/25 | 0/15 | NA |
| RF-negative and anti-CCP negative | 11/25 | 0/15 | NA |
| RF-negative and anti-CCP-positive | 9/25 | 5/15 | NA |
| RF-positive and anti-CCP-positive | 4/25 | 10/15 | NA |
↵* Data are mean ± standard deviation. RF: rheumatoid factor; CRP: C-reactive protein; Anti-CCP: anti-cyclic citrullinated peptide; ANA: antinuclear antibody; UA: undifferentiated arthritis; RA: rheumatoid arthritis; SpA: spondyloarthropathy; NA: not applicable.