Table 1. Demographic Data (n = 153).

Variable	Value
Age (yr)	70.0 (64.0–74.0)
Sex (female : male)	109 : 44
Body mass index (kg/cm2)	24.4 (22.7–26.7)
Diagnosis
Spinal stenosis	115 (75.1)
Herniated disc	21 (13.7)
Spondylolisthesis	13 (8.5)
Duration of symptom (yr)	3.2 (2.9–3.6)
Duration of medication (yr)	0.7 (0.5–0.9)

Values are presented as median (interquartile range) or number (%).