| |
Lesion
|
Per subject
|
Ilium R+L
|
Sacrum R+L
|
|---|
|
Kappa value (95% CI)
|
ER
|
0.72 (0.57 to 0.84)
|
0.67 (0.53 to 0.79)
|
0.56 (0.42 to 0.70)
|
| |
BME
|
0.61 (0.47 to 0.74)
|
0.64 (0.50 to 0.76)
|
0.71 (0.57 to 0.82)
|
| |
FI
|
0.55 (0.41 to 0.68)
|
0.45 (0.32 to 0.58)
|
0.60 (0.46 to 0.72)
|
| |
EEa
|
0.73 (0.63 to 0.84)
|
0.68 (0.58 to 0.79)
|
0.45 (0.35 to 0.56)
|
| |
BFa
|
0.63 (0.53 to 0.73)
|
0.60 (0.50 to 0.70)
|
0.32 (0.22 to 0.42)
|
|
ICC(3, 1)/ICC(2, 1)
|
ER
|
0.79/0.75
|
0.78/0.74
|
0.71/0.67
|
| |
BME
|
0.93/0.92
|
0.88/0.86
|
0.94/0.93
|
| |
FI
|
0.71/0.63
|
0.54/0.46
|
0.75/0.70
|
| |
EEa
|
0.72/0.71
|
0.65/0.63
|
0.55/0.55
|
| |
BFa
|
0.55/0.55
|
0.59/0.59
|
0.35/0.35
|
- aEE and BF were assessed as score per four joint surfaces irrespective of the number of SIJ MRI slices affected. Kappa values: MRI lesion as binary variable per subject. Intraclass correlation coefficients: MRI lesion as sum score per subject. AS, ankylosing spondylitis; BF, backfill; BME, bone marrow edema; CI, confidence interval; EE, extended erosion; ER, erosion; FI, fat infiltration; ICC(3, 1), intraclass correlation coefficient (3, 1): Readers are considered not representative of a larger population of readers; ICC(2, 1), Intraclass correlation coefficient (2, 1): Readers are considered representative of a larger population of readers.
