Table II.

Intraobserver reliability

	Intra-observer reliability
Variable	Rater 1 Fellow N = 20	Rater 2 Radiologist N = 20	Rater 3 Resident N = 20	Rater 4 Attending N = 20	Pooled estimates (All readers)
Objective parameters
Acetabular inclination (w)	0.88	0.62	1	0.55	0.76
	(0.71, 1.00)	(0.33, 0.91)	(1, 1)	(0.28, 0.82)	(0.55, 0.98)
Alpha angle lateral (i)	0.88	0.81	0.71	0.79	0.80
	(0.72, 0.95)	(0.59, 0.92)	(0.41, 0.87)	(0.55, 0.91)	(0.56, 1)
Head–neck offset AP (w)	0.53	0.64	1	0.58	0.69
	(0.19, 0.88)	(0.19, 1)	(1, 1)	(0.23, 0.93)	(0.36, 1)
Head–neck offset ratio AP (i)	0.41	0.60	0.10	0.42	0.38
	(−0.02, 0.71)	(0.24, 0.82)	(−0.34, 0.51)	(−0.01, 0.72)	(−0.03, 0.8)
Head–neck offset lateral (w)	0.45	0.67	0.59	0.71	0.61
	(0.08, 0.82)	(0.33, 1)	(0.27, 0.92)	(0.47, 0.95)	(0.28, 0.93)
Lateral centre edge angle AP (i)	0.95	0.88	0.79	0.36	0.75
	(0.88, 0.98)	(0.74, 0.95)	(0.56, 0.91)	(−0.07, 0.68)	(0.49, 1)
Subjective parameters
Acetabular depth (s)	1	1	1	0.57	0.89
	(1, 1)	(1, 1)	(1, 1)	(0.14, 1)	(0.68, 1)
Acetabular version (s)	0.60	0.58	0.38	0.58	0.54
	(0.26, 0.94)	(0.19, 0.98)	(−0.09, 0.86)	(0.24, 0.91)	(0.15, 0.92)
Herniation pits AP (s)	0.42	−0.05	1	1	0.59
	(0.06, 0.78)	(−0.12, 0.02)	(1, 1)	(1, 1)	(0.41, 0.78)
Head sphericity AP (s)	0.48	0.86	0.10	0.71	0.54
	(0.11, 0.85)	(0.59, 1)	(−0.28, 0.48)	(0.41, 1.00)	(0.20, 0.87)
Head sphericity lateral (s)	0.70	0.68	0.60	0.29	0.57
	(0.40, 1.00)	(0.35, 1)	(0.28, 0.92)	(−0.16, 0.74)	(0.21, 0.92)
Joint congruency (s)	0.12	1	1	0.63	0.69
	(−0.32, 0.56)	(1, 1)	(1, 1)	(0.24, 1.00)	(0.39, 0.98)
Position of head centre (s)	0.70	0.30	0.39	0.78	0.54
	(0.40, 1.00)	(−0.10, 0.70)	(−0.01, 0.80)	(0.50, 1.00)	(0.19, 0.89)
Tönnis grade (w)	0.44	1	0.17	0.31	0.48
	(0.15, 0.72)	(1, 1)	(−0.05, 0.39)	(−0.19, 0.81)	(0.17, 0.79)
Diagnosis (w)	0.92	1	0.54	0.68	0.79
	(0.78, 1.00)	(1, 1)	(0.19, 0.89)	(0.39, 0.96)	(0.55, 1)

s, simple kappa coefficient (95% CI); w, weighted kappa coefficient (95% CI); i, ICC (95% CI).