Table 1.

Repeatability of features used for assessing destructive change and growth abnormalities radiographically in children and young adults with hip-related juvenile idiopathic arthritis^a

Markers of damage	Right hip		Left hip
	Intra-reader kappa	Inter-reader kappa	Intra-reader kappa	Inter-reader kappa
Destructive change
Erosions of femoral head (0–4 scale)	0.6	0.3	0.6	0.2
Erosions of femoral neck (0–1 scale)	0.8	0.3	0.5	0.1
Erosions of acetabulum (0–3 scale)	0.5	0.1	0.3	0.2
Femoral head flattening (subjective, 0–4 scale)	0.7	0.4	0.7	0.3
Femoral head flattening (Mose circle, 0–4 scale)	0.6	0.4	0.6	0.7
Enlarged fovea (0–2 scale)	0.4	0.2	0.2	0.1
Sclerosis of acetabulum (0–4 scale)	0.6	0.1	0.6	0.2
Sclerosis of femoral head (0–4 scale)	0.3	0.5	0.6	0.4
Joint space narrowing (0–2 scale)	0.8	0.5	0.7	0.4
Growth abnormality b
Closed physis (no [0]/yes [1])	0.9	0.4	0.9	0.5

^aFindings are given for categorical scoring features, using kappa statistics, based on 75 patients

^bBased on the first 41 patients