Table 1.
Main characteristics of arthritis in patients with primary SS
| Feature | Patients, n (%) |
|---|---|
| Prevalence (n = 5276) | 834 (16) |
| Female:male ratio | Not detailed |
| Age at diagnosis, mean, years | Not detailed |
| Clinical features of arthritis (n = 84), n/N (%) | |
| Symmetrical | 60/84 (71) |
| Monoarthritis | 14/84 (17) |
| Number of joints involved (n = 163) | |
| <5 joints involved | 144 (88) |
| ≥5 joints involved | 19 (12) |
| Location of arthritis (n = 152) | |
| Proximal IP joint | 57 (35) |
| MCP joint | 57 (35) |
| Wrist | 49 (30) |
| Elbow | 25 (15) |
| Knee | 17 (10) |
| Ankle | 16 (10) |
| Shoulder | 9 (6) |
| MTP joint | 8 (5) |
| Distal IP joint | 5 (3) |
| Radiological bone erosions (n = 309) | 15 (5) |
| Anti-CCP positivity (n = 1907) | 118 (7) |
Variables were not detailed in all studies and the prevalence of a specific feature is stated as the number of cases with that feature/number of cases in which the feature was detailed.