Table 2.

Comparison of ODI.

Follow-up time point	ODI
	Experimental group	Control group
Pre operation	71.3 ± 14.2	68.9 ± 15.4
1 mo post operation	23.7 ± 5.6*	27.8 ± 6.8*
3 mo post operation	17.5 ± 6.9**	21.6 ± 7.1**
6 mo post operation	11.2 ± 2.1	10.9 ± 1.1
12 mo post operation	9.2 ± 1.4	9.3 ± 0.8

ODI = Oswestry Dability Index.

^*, and

^** mean that P < .05.