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Table 2 Baseline characteristics of patients with juvenile idiopathic arthritis (JIA) and non-rheumatologic controls. Osteochondral changes are defined as one or more of the following: articular surface erosions, subchondral cysts or condylar flattening

From: MRI thresholds for discrimination between normal and mild temporomandibular joint involvement in juvenile idiopathic arthritis

  JIA with/without active TMJ involvement Non-rheumatologic
All Unilateral Bilateral Both TMJs unaffected -
# of patients, n 67 22 26 19 24
Age at examination, median (range) 13 (5–17) 13 (5–17) 13.5 (5–17) 12 (7–17) 9.5 (2–17)
Female, n (%) 49 (73) 17 (77) 21 (81) 11 (58) 9 (38)
JIA subtype      
 Oligoarticular, n (%) 24 (36) 5 (23) 10 (38) 9 (47)
 Polyarticular, n (%) 31 (46) 12 (55) 13 (50) 6 (32)
 Systemic Onset, n (%) 0 0 0 0
 Psoriatic, n (%) 5 (8) 3 (14) 0 2 (11)
 Enthesitis–related, n (%) 7 (10) 2 (8) 3 (12) 2 (10)
Age at diagnosis, median (range) 9 (1–15) 6.5 (15–1) 8 (2–14) 5 (3–13)
TMJ pain within 2 weeks of MRI, n (%) 22 (33) 9 (41) 12 (46) 1 (5)
Decreased mouth opening, <40 mm, n (%) 24 (36) 7 (32) 8 (31) 3 (16)
Crepitation, n (%) 10 (15) 4 (18) 5 (19) 1 (5)
Uveitis, n (%) 11 (16) 2 (9) 6 (23) 3 (16)
Osteochondral changes, n (%) 51 (76) 20 (91) 22 (85) 9 (47)