Table 3 |
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|
Agreement by kappa statistics and intraclass correlation coefficients by four readers jointly and for 60 study subjects. |
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|
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 |
|
|
|
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|
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. |
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|
Weber et al. Arthritis Research & Therapy 2012 14:R124 doi:10.1186/ar3854 |
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