Table 1. Pre-operative and post-operative clinical indices.

Clinical index	Pre-operative score	Post-operative score	P value
ODI	46.8±13.2	25.7±15.2	<0.001
VAS	7.8±1.7	3.3±3.6	<0.001
SF12-PC	29.6±5.9	35.3±9.5	<0.001
SF12-MC	46.5±10.7	50.5±12.3	0.053

ODI, Oswestry disability index; VAS, visual analog scale.