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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)

From: “Simple mechanical devices did not improve pelvis positioning in AP pelvis radiographs for reliable assessment of the acetabular orientation”

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