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Improvement of the Oswestry Disability Index (ODI) in reference to the preoperative status (in % of the population)
| 3 months | 6 months | 12 months | 24 months | |
|---|---|---|---|---|
| ODI improvement of 15 % | 72 % | 82 % | 85 % | 85 % |
| ODI improvement of 25 % | 59 % | 75 % | 82 % | 83 % |
