Table 2.

Comparison of perioperative parameters between groups.

Variable	Laminectomy N = 27	UPSF N = 27	BPSF N = 24	p-valuea
Operation time (min)a,mean (SD)	46.8 (5.15)	70.7 (4.45)	102.7 (10.4)	0.000
Bleeding (cc),a mean (SD)	80.9 (13.01)	141.1 (16.1)	228.9 (20.5)	0.000
Hospital stay (day),amean (SD)	2.67 (0.73)	2.85 (0.60)	2.83 (0.76)	0.570
Folow up (months)a,mean (SD)	6.33 (0.55)	6.22 (0.57)	6.25 (0.60)	0.766

Abbreviation: UPSF: unilateral pedicle screw fixation, BPSF: bilateral pedicle screw fixation.

one-way ANOVA.

Statistical significant as p < 0.05.