Table 2.

Oswestry disability index (ODI) measurements in the long-term follow-up after X-Stop implantation

Time point	Mean	Std. Dev.	Range
Preoperative	32.600	16.007	8–80
6 weeks po.	22.745	15.646	0–85
6 months po.	21.463	17.415	0–66
12 months po.	15.263	13.649	0–44
24 months po.	20.333	17.501	0–42