Table 4.

Clinical results (bilateral vs. unilateral fusion, bilateral vs. no fusion)

	Bilateral (n = 26)	Unilateral (n = 9)	No fusion (n = 7)	Bilateral vs. unilateral p - value	Bilateral vs. no fusion p - value
Preoperative ODI score	51.77 ± 12.49	49.33 ± 7.12	51.14 ± 5.54	0.901	0.594
Final ODI score	22.62 ± 9.46	29.56 ± 5.23	34.29 ± 4.33	0.050	0.004
Satisfaction, yes/no, n (%)	22/4 (84.6)	4/5 (44.4)	2/5 (28.6)	0.058	0.002

Data are presented as mean ± SD unless noted otherwise. Satisfaction was based on Brodsky’s criteria. Abbreviation: ODI Oswestry Disability Index.