Table 6.
The most likely alternative diagnoses among patients, first-time registered with rheumatoid arthritis diagnosis in the Danish National Patient Registry during 1977–2016, but not confirmed by reviewing medical records
| Alternative diagnoses | Number of nonconfirmed cases |
|---|---|
| Total number of nonconfirmed cases | 106 |
| Osteoarthritis | 29% (n=31) |
| PMR or PMR with giant cell arteritis | 9% (n=10) |
| Crystal arthropathy | 9% (n=10) |
| Psoriatic arthritis | 8% (n=9) |
| Connective tissue diseases | 5% (n=5) |
| Tenosynovitis | 3% (n=3) |
| Seronegative oligoarthritis | 2% (n=2) |
| Enteropathic arthritis | 1% (n=1) |
| Reactive arthritis | 1% (n=1) |
| Juvenile idiopathic arthritis | 1% (n=1) |
| Rotator cuff syndrome | 1% (n=1) |
| Subacromial bursitis | 1% (n=1) |
| Dupuytren’s contracture | 1% (n=1) |
| Arthralgia | 1% (n=1) |
| Joint cyst | 1% (n=1) |
| Myalgia | 1% (n=1) |
| Unknown | 26% (n=27) |
Abbreviation: PMR, polymyalgia rheumatica.