Table 1.

Baseline demographic data. Mean ± SD unless specified. * defined from diagnosis to basel

All patientsRheumatoid arthritisPsoriatic arthritisAnkylosing spondylitisUndifferentiated arthritis
Total n (%)940 (100)359 (38)251 (27)217 (23)113 (12)
Age (years)49 ± 1453 ± 1449 ± 1343 ± 1344 ± 15
Disease duration (years)*7.8 ± 8.58.2 ± 8.27.4 ± 7.88.3 ± 10.26.3 ± 6.6
Female58%73%59%34%52%