Table 2.

Patient characteristics and perioperative data

Variable	Pre-intervention (N = 44)	Post-intervention (N = 41)	P value
Age (years)	63 (18–85)	59 (17–83)	0.22
Gender (female vs. male)	30 vs. 14	27 vs. 14	1.0
Height (cm)	166 (149–192)	171 (155–190)	0.11
Weight (kg)	70 (45–129)	69 (54–112)	0.90
Pre-operative daily opioid consumption (n)	23	26	0.38
Duration of surgery (min)	288 (138–406)	275 (114–491)	0.26
Number of instrumented spinal levels	9.5 (4–15)	10 (4–16)	0.61
Surgical approach
Posterior	44	41	1.00
Thoracic	1	0	1.00
Smith–Peterson osteotomy	5	1	0.20
Pedicle subtraction osteotomy	9	9	1.00
Iliac instrumentation	17	28	0.009
Postoperative length of stay before discharge	9 (6.3–10.8)	7 (5–10)	0.39

Values are median (interquartile range) or number of patients