Table 3

Variability between views or between reading sessions of joint space width (mm) of hips with osteoarthritis and hips without osteoarthritis (OA) on radiographs performed in the same patients

	Number	Mean differences	Standard deviations	95% confidence intervals	Limits of agreement
Between views
all	116	0.05	0.29	0.0, 0.10	−0.53 to 0.63
without OA	70	0.08	0.27	0.02, 0.14	−0.46 to 0.62
with OA	46	0.02	0.31	−0.07, 0.11	−0.60 to 0.64
Between reading sessions
standing without OA	70	0.03	0.13	0.0, 0.06	−0.20 to 0.26
supine without OA	70	0.03	0.13	0.0, 0.06	−0.20 to 0.26
standing with OA	46	0.02	0.11	−0.01, 0.05	−0.20 to 0.24
supine with OA	46	−0.002	0.13	−0.04, 0.04	−0.26 to 0.26