Concordance between MRI and Radiographs, BL and Wk 104; and Change BL to Wk 104
| N | Present/Present n (%) | Absent/Absent n (%) | Absent/Present n (%) | Present/Absent n (%) | κ (95% CI) | P-value* | |
|---|---|---|---|---|---|---|---|
| BL Erosion: MRI/radiographs | 224 | 50 (22.3) | 112 (50.0) | 14 (6.3) | 48 (21.4) | 0.42 (0.30–0.53) | <0.0001 |
| Wk 104 Erosion: MRI/radiographs | 222 | 44 (19.8) | 119 (53.6) | 15 (6.8) | 44 (19.8) | 0.41 (0.29–0.53) | 0.0002 |
| BL: Erosion on MRI/sacroiliitis on radiographs | 224 | 60 (26.8) | 97 (43.3) | 29 (12.9) | 38 (17.0) | 0.39 (0.26–0.51) | 0.27 |
| Wk 104: Erosion on MRI/sacroiliitis on radiographs | 222 | 56 (25.2) | 99 (44.6) | 35 (15.8) | 32 (14.4) | 0.37 (0.25–0.50) | 0.71 |
| Erosion decrease: MRI/radiographs | 221 | 4 (1.8) | 162 (73.3) | 6 (2.7) | 49 (22.2) | 0.06 (−0.05, 0.16) | <0.0001 |
| Erosion increase: MRI/radiographs | 221 | 2 (0.9) | 187 (84.6) | 17 (7.7) | 15 (6.8) | 0.03 (−0.12, 0.18) | 0.72 |
| Erosion decrease on MRI/sacroiliitis grade decrease on radiographs | 221 | 8 (3.6) | 154 (69.7) | 14 (6.3) | 45 (20.4) | 0.08 (−0.05, 0.21) | <0.0001 |
| Erosion increase on MRI/sacroiliitis grade increase on radiographs | 221 | 4 (1.8) | 180 (81.4) | 24 (10.9) | 13 (5.9) | 0.09 (−0.07, 0.25) | 0.07 |
*McNemar’s test for discordance asymmetry.
BL, baseline; Wk, Week.