Table 1.

Demographic data and clinical characteristics

Demographic data	Group A (n = 44)	Group B (n = 38)	P
Mean age (years)	66.4 ± 6.7	64.1 ± 7.8	0.16
Duration of symptoms (months)	45.1 ± 24.2	50.8 ± 23.1	0.29
Gender (M/F)	19/25	15/23	0.73
Preoperative diagnosis
Symptomatic degenerative disc disease	15 (34.1 %)	11(28.9 %)	0.62
Symptomatic two-level lumbar stenosis	18 (40.9 %)	14 (36.9 %)	0.71
Symptomatic lumbar stenosis with segmental instability	11 (25.0 %)	13 (34.2 %)	0.36
Levels of fusion
L3- L5/L4- S1	13/31	14/24	0.48