Diagnoses of 90 rheumatic disease control patients
| Diagnosis | Number of patients |
| Systemic lupus erythematosus (SLE) | 13 |
| Temporal arteritis and/or polymyalgia rheumatica | 6 |
| Systemic sclerosis (SSc) | 5 |
| Polymyositis or dermatomyositis | 3 |
| Mixed connective tissue disease (MCTD) | 2 |
| Raynaud's syndrome | 1 |
| Reactive arthritis (ReA) or morbus Reiter | 21 |
| Osteoarthritis | 21 |
| Psoriatic arthritis | 9 |
| Uric arthritis | 3 |
| Arthritis paraneoplastica | 3 |
| Lyme arthritis | 3 |