Table 1.

Baseline clinical data

	Iliac bone (n = 53)	Local bone (n = 56)
Age	50.1 ± 13.4	48.6 ± 15.3	n.s
Sex (male:female)	26:27	33:23	n.s.
BMI	24.1 ± 3.9	23.7 ± 3.2	n.s.
Smoking	16/53	17/56	n.s.
Employment
Employed full time	16	17
Employed parttime	3	3
Unemployed	34	36	n.s.
Disease
Disc hernia	6	6
Spondylolisthesis	26	25
Canal stenosis	21	25	n.s.
Level
L3/4	4	7
L4/5	44	38
L5/S	5	11	n.s.