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Contingency table of the observation frequency: Agreement between magnetic resonance imaging (MRI) and arthroscopy (mild cartilage changes).
| Arthroscopy (Cartilage changes) | Total | |||
|---|---|---|---|---|
| Changes | Positive | Negative | ||
| MRI | Positive | 9 | 14 | 23 |
| (Bone changes) | Negative | 2 | 4 | 6 |
| Total | 11 | 18 | 29 | |
Concordance rate of observation frequency=44.8%, κ coefficient= 0.033,
95% confidence interval [-0.284, 0.350], p=0.397
