Table 2 Agreement between two observers with respect to magnetic resonance imaging (MRI) characteristics per site per sacroiliac joint in 68 patients with inflammatory low back pain
MRI characteristic per site | Sacroiliac joint | Present (n) | Absent (n) | Concordance rate | Discordance rate | Cohen's kappa value |
|---|---|---|---|---|---|---|
Inflammation | ||||||
At any site | Right | 18 | 40 | 0.85 | 0.15 | 0.68 |
Left | 14 | 39 | 0.78 | 0.22 | 0.51 | |
Bone marrow ± subchondral bone | Right | 17 | 43 | 0.88 | 0.12 | 0.73 |
Left | 12 | 47 | 0.87 | 0.13 | 0.65 | |
Joint capsule | Right | 5 | 54 | 0.87 | 0.13 | 0.46 |
Left | 3 | 47 | 0.74 | 0.26 | 0.12 | |
Ligaments | Right | 4 | 57 | 0.90 | 0.10 | 0.49 |
Left | 3 | 57 | 0.88 | 0.12 | 0.38 | |
Joint space | Right | 6 | 55 | 0.90 | 0.10 | 0.58 |
Left | 8 | 54 | 0.91 | 0.09 | 0.68 | |
Chronic changes | Right | 6 | 49 | 0.81 | 0.19 | 0.37 |
Left | 11 | 49 | 0.88 | 0.12 | 0.66 |