Table 2.

Cohen’s Kappa values showed a low correlation for the categorial measurement values between the radiographs of (a) positioning I, (b) positioning II, (c) positioning III and the corresponding CT scans (COS: cross-over sign, ISS: ischial spine sign)

Cohen’s Kappa	(a)	(b)	(c)
COS left	0.54	0.50	0.50
COS right	0.24	0.33	0.45
ISS left	0.29	0.29	0.29
ISS right	0.42	0.30	0.42