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Distribution of KOA severity levels in the OAI dataset.
| Visiting cycle | KL0 | KL1 | KL2 | KL3 | KL4 | Missing KL | Available Radiographs |
|---|---|---|---|---|---|---|---|
| Baseline | 3448 | 1597 | 2374 | 1239 | 295 | 639 (6.66%) | 4796 |
| 12-month | 3113 | 1445 | 2221 | 1230 | 355 | 1228 (12.8%) | 3660 |
| 36-month | 2735 | 1252 | 1986 | 1147 | 377 | 2095 (21.84%) | 4106 |
| 48-month | 2606 | 1196 | 1884 | 1062 | 389 | 2455 (25.59%) | 3700 |
| 72-month | 1866 | 1007 | 471 | 201 | 26 | 6021 (62.77%) | 3085 |
| 96-month | 1899 | 987 | 488 | 239 | 47 | 5932 (61.84%) | 2932 |
