Table 1

(Inter-rater reliability: results of comparison between two ultrasound observers)

Kappa (95% CI)

ICC (95% CI)


Osteophyte (right femur)

0.77 (0.31,1.23)


Osteophyte (left femur)

0.65 (0.41,1.35)


Osteophyte (right tibia)

0.88 (0.18,1.12)


Osteophyte (left tibia)

0.88 (0.41,1.35)


Effusion size (right)

0.70 (0.45,0.95)


Effusion size (left)

0.85 (0.72,0.98)


Effusion presence (right)

0.65 (0.21, 1.1)


Effusion presence (left)

0.77 (0.31, 1.23)


Notch thickness (right)

0.68 (0.43,0.94)


Notch thickness (left)

0.62 (0.32,0.92)


Lateral femoral cartilage thickness (right)

0.06 (0.00,0.54) *


Lateral femoral cartilage thickness (left)

0.50 (0.14,0.86)


Medial femoral cartilage thickness (right)

0.57 (0.25,0.90)


Medial femoral cartilage thickness (left)

0.42 (0.02,0.82)


*after removing the 2 identified outliers, ICC was 0.67 (0.38,0.95)

Abraham et al. BMC Musculoskeletal Disorders 2011 12:70   doi:10.1186/1471-2474-12-70

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