Table 1. Demographic data of the patients included in this study.

Characteristics		Values
No. of patients		16
Mean age, yr		68.0 (54–83)
Gender, men/women		7/9
Mean height, cm		158.1 (147.5–173.5)
Mean weight, kg		65.7 (51.6–89.6)
Body mass index, kg/m2		26.3 (22.1–37.4)
Screw placed level
	L1	0
	L2	2
	L3	14
	L4	30
	L5	28
	S1	8

Data are presented as mean (range) or number (%).