Characteristic | Frequency (%) or Median (25-75%) |
---|---|
Age at enrollment (years) | 12.0 (7.0 – 15.0) |
Female | 4,760 (71%) |
White Race | 5,432 (81%) |
Private health insurance | 4,515 (67%) |
Disease duration (years) | 2.5 (0.4 – 6.1) |
ILAR category: | |
 Oligoarthritis, persistent | 1,634 (24%) |
 Oligoarthritis, extended | 519 (8%) |
 Polyarthritis, RF- | 2,184 (33%) |
 Polyarthritis, RF+ | 472 (7%) |
 Psoriatic arthritis | 490 (7%) |
 Enthesitis related arthritis | 687 (10%) |
 Systemic arthritis | 571 (9%) |
 Undifferentiated arthritis | 147 (2%) |
 ANA+ | 3,004 (45%) |
 RF+ | 556 (8%) |
 CCP+ | 447 (7%) |
 HLA-B27+ | 545 (8%) |
 Polyarthritis course | 4,269 (64%) |
 Uveitis, ever | 721 (11%) |
 Number of active joints | 1 (0 – 3) |
 Physician global assessment | 1 (0 – 3) |
 Active enthesitis | 469 (7%) |
 Clinically active sacroiliitis | 237 (4%) |