Table 3.

Comparison of pre-operative and post-operative patient-reported outcomes by device type

	Pre-operative (N = 30)	6-month post-operative (N = 30)	†p value*
Static device (mean ± SD)
ODI	40.9 ± 15.2	20.4 ± 15.7	< 0.001
VAS back pain	6.1 ± 2.6	2.8 ± 2.5	< 0.001
VAS leg pain	6.2 ± 2.4	2.4 ± 2.7	< 0.001
Expandable device (mean ± SD)
ODI	40.1 ± 16.2	20.4 ± 16.8	< 0.001
VAS back pain	6.8 ± 2.5	3.7 ± 3.0	< 0.001
VAS leg pain	6.0 ± 2.7	2.9 ± 2.8	< 0.001

ODI, Oswestry Disability Index; VAS, visual analog scale

Italics indicates statistical significance

*p values calculated using paired Student’s t tests