Disease activity: number of tender and swollen joints for each diagnosis
| Diagnosis | CPPD only (n=131) | Seronegative RA only (n=103) | Seropositive RA only (n=147) | CPPD+RA (n=53) | Gout only (n=28) | PMR only (n=28) | |
| Number of tender joints | 0 | 6 (4.6%) | 0 | 8 (5.4%) | 2 (3.4%) | 0 | 4 (14.3%) |
| 1 | 10 (7.6%) | 9 (8.7%) | 6 (4.1%) | 2 (3.4%) | 5 (17.9%) | 0 | |
| 2–4 | 32 (24.4%) | 21 (20.4%) | 34 (23.1%) | 12 (22.6%) | 10 (35.7%) | 6 (21.4%) | |
| ≥5 | 79 (60.3%) | 70 (68.0%) | 96 (65.3%) | 34 (64.2%) | 11 (39.2%) | 17 (60.7%) | |
| no data | 4 (3.1%) | 3 (2.9%) | 3 (2.0%) | 3 (5.7%) | 1 (3.6%) | 1 (3.6%) | |
| Number of swollen joints | 0 | 3 (2.3%) | 20 (19.4%) | 20 (13.6%) | 2 (3.4%) | 6 (21.4%) | 17 (60.7%) |
| 1 | 30 (22.9%) | 17 (16.6%) | 11 (7.5%) | 4 (7.5%) | 8 (28.6%) | 4 (14.3%) | |
| 2–4 | 56 (42.7%) | 31 (30.1%) | 50 (34.0%) | 29 (54.7%) | 8 (28.6%) | 5 (17.9%) | |
| ≥5 | 35 (26.7%) | 29 (28.2%) | 55 (37.4%) | 15 (28.3%) | 5 (17.9%) | 2 (7.1%) | |
| no data | 7 (5.3%) | 6 (5.5%) | 11 (7.5%) | 3 (5.7%) | 1 (3.6%) | 0 |
CPPD, calcium pyrophosphate crystal deposition disease; PMR, polymymalgia rheumatica; RA, rheumatoid arthritis.