Table 1.

The demographic data of the patients

No. of patients	60
Age, mean (range), yr	70.7 ± 8.4 (49–88)
Sex (Male / Female)	30/ 30
Body mass index (kg/m2)	24.5 ± 4.4
Duration of illness, (range), month	50.9 ± 49.9 (2–180)
Diagnosis
Lumbar spinal stenosis	42 (70%)
Lumbar spondylolisthesis	13 (22%)
Degenerative lumbar scoliosis	5 (8%)
Surgical method
Decompression	26 (43%)
Fixation	34 (57%)