Table 2.

Comparisons of efficacy between pain at single level and two levels (mean±SD)

	VAS		ODI
	Pre-treatment	Post-treatment	Pre-treatment	Post-treatment
Single level (n=18)	7.83±1.06	2.18±1.58*	49.83±5.02	13.56±12.55*
Two level (n=6)	6.58±1.65	2.18±2.53#	45.33±4.93	20.83±16.47#

VAS visual analog scale, ODI Oswestry Disability Index

P*<0.001

P^#<0.05