Inter-rater reliability for individual radiological features and the three definitions of radiographic hip osteoarthritis studied (n = 148)
| Definition of OA | Inter-rater reliability |
|---|---|
| Inter-rater reliability is presented by intraclass correlation coefficient (two way mixed effect model, consistency definition) for minimal joint space (as continuous variable) and by κ for other individual radiological features and three definitions of hip OA studied (95% confidence intervals in parentheses). | |
| MJS, minimal joint space. | |
| Radiological features | |
| Subchondral sclerosis | |
| Acetabulum | 0.51 (0.35 to 0.67) |
| Femoral head | 0.66 (0.22 to 1.00) |
| Osteophytes | |
| Acetabulum | 0.23 (0.06 to 0.40) |
| Femoral head | 0.34 (0.19 to 0.50) |
| Cysts | 0.32 (−0.17 to 0.82) |
| MJS (continuous) | 0.85* (0.80 to 0.89) |
| Definitions studied | |
| Kellgren, ⩾grade 2 | 0.68 (0.44 to 0.92) |
| MJS, ⩽2.5 mm | 0.62 (0.43 to 0.81 |
| Croft grade, ⩾grade 3 | 0.51 (0.35 to 0.67) |