Table 5.

Preoperative and postoperative clinical outcome scores: averages (standard deviation)

	Preoperative	Postoperative	P value
Control group (n = 12)
VAS back	8.1 (2.9)	4.7 (3.6)	< 0.01
VAS leg	7.8 (2.6)	4.4 (3.8)	< 0.01
ODI	48.5 (17.3)	35.7 (25.7)	0.13
SF-36 PCS	16.4 (19.2)	42 (22.5)	< 0.01
SF-36 MCS	65.6 (22)	53.4 (29.3)	0.37
Device group (n = 35)
VAS back	7.2 (2.3)	5 (2.33)	< 0.01
VAS leg	7.5 (2.1)	4.2 (3.3)	< 0.01
ODI	54.1 (17)	36.1 (21.1)	< 0.01
SF-36 PCS	16.2 (13.9)	36.2 (22.5)	< 0.01
SF-36 MCS	47.1 (25.3)	62.8 (28)	0.01

MCS/PCS mental/physical component summary, ODI Oswestry Disability Index, VAS visual analog scale