. 2020 Nov 5;10(11):e038643. doi: 10.1136/bmjopen-2020-038643

Table 5.

Agreement between ultrasound and radiographic findings (n=63)

Findings rated on ultrasound and X-rays	Ultrasound operator A			Ultrasound operator B
Findings rated on ultrasound and X-rays	Observed agreement (%)	Expected agreement (%)	Kappa (95% CI)	Observed agreement (%)	Expected agreement (%)	Kappa (95% CI)
Femoral osteophytes	85	80	0.24 (0.08 to 0.41)	83	79	0.21 (0.04 to 0.40)
Acetabular osteophytes	90	84	0.37 (0.14 to 0.55)	90	86	0.26 (0.01 to 0.48)
Femoral head deformation	92	88	0.35 (0.08 to 0.58)	93	87	0.42 (0.17 to 0.66)
OA grading	90	79	0.51 (0.34 to 0.68)	89	80	0.46 (0.27 to 0.64)

OA, osteoarthritis.