Parameters of the ACR 1987 and the ACR/EULAR 2010 criteria for rheumatoid arthritis in the 16 patients with pSS
| At inclusion | At follow-up | |
|---|---|---|
| Parameters of the ACR 1987 classification criteria for RA | ||
| Presence of morning stiffness, n (%) | 5 (31.2) | 4 (25.0) |
| Arthritis of more than 3 joints, n (%) | 4 (25.0) | 7 (43.7) |
| Arthritis of the hand, n (%) | 6 (37.5) | 10 (62.5) |
| Symmetrical arthritis, n (%) | 4 (25.0) | 6 (37.5) |
| Presence of rheumatoid nodules, n (%) | 0 (0.0) | 0 (0.0) |
| Positive rheumatoid factor, n (%) | 13 (81.2) | 13 (81.2) |
| Presence of radiological erosions, n (%) | 0 (0.0) | 5 (31.2) |
| Number of patients fulfilling criteria, n (%) | 0 (0.0) | 7 (43.7) |
| Total number of fulfilled criteria, median (minimum–maximum) | 2 (1–3) | 2 (0–6) |
| Parameters of the ACR/EULAR 2010 classification criteria for RA | ||
| Arthritis, median number of points (minimum–maximum) | 0 (0–5) | 1 (0–3) |
| RF/ACPA, median number of points (minimum–maximum) | 3 (2–3) | 3 (1–3) |
| Disease duration, median number of points (minimum–maximum) | 1 (1–1) | 1 (1–1) |
| CRP/ESR, median number of points (minimum–maximum) | 1 (0–1) | 1 (0–1) |
| Number of patients fulfilling criteria, n (%) | 7 (43.7) | 8 (50.0) |
| Total number of fulfilled criteria, median (minimum–maximum) | 5 (3–10) | 5 (1–8) |
According to the ACR 1987 classification for the diagnosis of RA,11 one point was attributed for each fulfilled criteria. The diagnosis of RA was made when 4 or more points were attributed.
For the ACR/EULAR 2010 criteria: the number of points was attributed for each criteria according to the classification,12 Maximum number of points for the criteria ‘arthritis’ is 5, for the criteria ‘RF/ACPA’: 3, for the criteria ‘disease duration’: 1, for the criteria ‘CRP/ESR’: 1.
The diagnosis of RA was made when 6 or more points were attributed.
ACR, American College of Rheumatology ACPA, anticitrullinated protein antibodies; CRP, C reactive protein; EULAR, European League Against Rheumatism; ESR, erythrocyte sedimentation rate; RA, rheumatoid arthritis; RF, rheumatoid factor.