Interspinous Spacer Implant in Patients with Lumbar Spinal Stenosis: Preliminary Results of a Multicenter, Randomized, Controlled Trial

Table 1

Baseline patient characteristics.

Characteristic	Superion (𝑛=80)	X-STOP (𝑛=86)
Age, mean ± SD, y	67 ± 9	67 ± 11
Male, n (%)	48 (60)	57 (66)
Body mass index, mean ± SD, kg/m^2	30 ± 5	30 ± 5
Tobacco use, n (%)
None	34 (43)	41 (48)
Previous use	35 (44)	34 (40)
Current use	11 (14)	11 (13)
Axial pain severity score, mean ± SD, mm	55 ± 27	54 ± 29
Extremity pain severity score, mean ± SD, mm	61 ± 26	64 ± 26
Oswestry disability index, mean ± SD, %	38 ± 13	40 ± 13