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Table 2 Radiologist findings and agreement for radiograph and MRI

From: Radiographs in screening for sacroiliitis in children: what is the value?

  Frequency (%)  
Rater 1 Rater 2 Rater 3 Rater 4 Rater 5 Kappa (95% CI)
Radiograph
 Global impression of sacroiliitis 8 (1) 8 (13) 27 (45) 17 (28) 25 (42) 0.34 (0.19–0.52)
 Erosion 7 (12) 6 (10) 25 (42) 12 (20) 15 (26) 0.42 (0.22–0.6)
 Sclerosis 8 (13) 8 (13) 21 (35) 19 (32) 32 (53) 0.35 (0.19–0.52)
 Ankylosis 0 (0) 0 (0) 2 (3) 3 (5) 4 (7)
 JSN 1 (2) 1 (2) 10 (17) 18 (30) 8 (13) 0.11 (0.03–0.2)
 JSW 7 (12) 5 (8) 13 (22) 10 (17) 8 (13) 0.4 (0.23–0.57)
MRI
 Global impression of acute/active sacroiliitisa 12 (20) 9 (15) 9 (15) 10 (17) 17 (28) 0.72 (0.52–0.86)
  BME 10 (17) 9 (15) 12 (20) 10 (17) 16 (27) 0.78 (0.58–0.9)
  Capsulitis 6 (10) 2 (3) 0 (0) 1 (2) 7 (12) 0.21 (−0.02–0.46)
  Enthesitis outside of SIJ 6 (10) 3 (5) 1 (2) 0 (0) 4 (7) 0.25 (− 0.01–0.52)
  SIJ effusion 1 (2) 3 (5) 7 (12) 11 (18) 17 (28) 0.19 (0.05–0.34)
 Global impression of structural chronicb lesions consistent with sacroiliitis 16 (27) 9 (15) 12 (20) 13 (22) 19 (32) 0.58 (0.39–0.74)
  Erosion 14 (23) 9 (15) 9 (15) 13 (22) 9 (15) 0.64 (0.48–0.81)
  Sclerosis 4 (7) 4 (7) 6 (10) 12 (20) 36 (60) 0.15 (0.01–0.31)
  Backfill 11 (18) 4 (7) 6 (10) 4 (7) 6 (10) 0.59 (0.24–0.81)
  Fat metaplasia 3 (5) 1 (2) 2 (3) 1 (2) 5 (8) 0.52 (−0.02–0.93)
  Ankylosis 0 (0) 1 (2) 0 (0) 1 (2) 1 (2)
  1. BME bone marrow edema, CI confidence interval, JSN joint space narrowing, JSW joint space widening, MRI magnetic resonance imaging, SIJ sacroiliac joint
  2. aAcute/active inflammatory lesions meeting the Assessment of Spondyloarthritis International Society definition of a positive MRI scan of the sacroiliac joints
  3. bStructural chronic lesions refer to the clear presence of typical findings such as sclerosis, erosion, fatty lesions, bone bridges, and ankyloses