Table 1.
Prevalence of anti-GPI autoantibodies in the different populations studied
| Anti-GPI | |||
|---|---|---|---|
| Patients n | n | (%) | |
| Group 1 | |||
| Healthy controls | 120 | 3 | (2·5) |
| Rheumatoid arthritis | 99 | 45 | (45·4) |
| Systemic lupus erythematosus | 85 | 45 | (52·9) |
| Spondylarthropathies | 28 | 7 | (25) |
| Primary Sjögren syndrome | 17 | 1 | (5·9) |
| Systemic sclerosis | 14 | 6 | (42·8) |
| Polymyositis | 11 | 5 | (45·4) |
| Adult-onset Still's disease | 9 | 4 | (44·4) |
| Group 2 | |||
| Rheumatoid arthritis | 116 | 33 | (28·4) |
| Unclassified arthritis | 38 | 8 | (21·1) |
| Non-RA differentiated arthritis | 41 | 11 | (26·8) |
| Spondylarthropathies | 14 | 3 | (21·4) |
| Crystal-induced arthritis | 5 | 0 | (0) |
| Osteoarthritis | 11 | 1 | (9·1) |
| Paramalignant arthritis | 3 | 1 | (33·3) |
| Parvovirus B19 arthritis | 1 | 1 | (100) |
| Connective tissue diseases | |||
| Primary Sjögren syndrome | 2 | 2 | (100) |
| Mixed connective tissue disease | 1 | 1 | (100) |
| Polymyositis | 1 | 0 | (0) |
| Behcet's disease | 1 | 1 | (100) |
| Wegener's granulomatosis | 1 | 1 | (100) |
| Unclassified | 1 | 0 | (0) |