Table 1.

Backgroud data comparison of two surgical groups

	MIS	Open	Significance
Pt number	43	37
Gender (M:F)	14:29	12:25	NS
Age	63 ± 9	66 ± 9	NS
Preop JOA score	11.1 ± 3.8	12.6 ± 3.4	NS
Preop ODI score	52.0 ± 13.2	48.9 ± 10.8	NS
Preop RDQ score	12.2 ± 4.5	13.7 ± 3.9	NS
Preop LBP VAS	73.1 ± 17.6	73.7 ± 20.2	NS
Preop % Slip	17.9 ± 4.9	18.4 ± 6.6	NS

Mean ± SD

NS no significant difference between two groups