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Percent of patients who achieved minimum clinically important difference
| Static device (N = 30) | Expandable device (N = 30) | p value* | |
|---|---|---|---|
| ODI (N) | 63.3% (19) | 60.0% (18) | 0.791 |
| VAS back pain (N) | 73.3% (22) | 66.7% (20) | 0.573 |
| VAS leg pain (N) | 70.0% (21) | 70.0% (21) | 1.000 |
VAS, visual analog scale; ODI, Oswestry Disability Index
*p values calculated using χ2 analysis
