ODI scores at baseline, 2 years, and 5 years
| ODI score | |||
|---|---|---|---|
| n | Mean (SD) | % Change (SD) | |
| Baseline | 75 | 62.7 (10.3) | — |
| 2 y | 71 | 39.8 (24.3) | −37.8% (36.0%) |
| 5 y | 51 | 36.2 (25.7) | −43.8% (37.1%) |
NOTE. The Wilcoxon test was used to compare baseline data; t tests were used to compare 24- and 60-month percent improvement.