Management of recurrent unilateral lumbar disc herniation in a single level: unilateral versus bilateral pedicle screws fixation with interbody fusion

Table 3 Comparison between unilateral group and bilateral group regarding the Oswestry disability index ODI

ODI		Unilateral	Bilateral	Test value^a	P value	Sig.
Preoperative	Mean ± SD	59.89 ± 9.41	60.84 ± 9.21	0.000	1.000	NS
Preoperative	Range	45–75	45–75	0.000	1.000	NS
1 month	Mean± SD	22.61 ± 3.96	24.44 ± 3.89	− 4.406	0.000	HS
1 month	Range	15–25	20–30	− 4.406	0.000	HS
6 months	Mean± SD	17.55 ± 1.91	16.99 ± 1.87	− 0.522	0.604	NS
6 months	Range	14–20	14–20	− 0.522	0.604	NS
12 months	Mean± SD	14.08 ± 1.32	14.27 ± 1.16	− 0.323	0.748	NS
12 months	Range	12–16	12–16	− 0.323	0.748	NS
Repeated measures ANOVA	F	277.744	455.119
Repeated measures ANOVA	P value	< 0.001	< 0.001