Table 1 Demographic characteristics of the patients with rheumatoid arthritis, osteoarthritis in the pilot study and of patients with rheumatoid arthritis and patients without rheumatoid arthritis in the validation study
Pilot phase | Validation phase | |||
|---|---|---|---|---|
RA (n = 15) | OA (n = 15) | RA (n = 47) | Non-RA (n = 48) | |
Mean age, years | 59.3 ± 6.3 | 66.8 ± 10.3 | 57.6 ± 12.2 | 54.5 ± 9.2 |
Female sex | 86.7% | 73.3% | 70.2% | 83.3% |
Symptom duration, years | 4.0 ± 3.5 | 10.8 ± 13.9 | 5.3 ± 10.2 | 4.9 ± 5.7 |