Comparison of Endoscope-Assisted and Microscope-Assisted Tubular Surgery for Lumbar Laminectomies and Discectomies: Minimum 2-Year Follow-Up Results

Table 2

Operative characteristics of patients.

	Group A	Group B	Group C	Group D
Duration of operation, mean (SD), min	95.23(38.36)	86.13(26.04)	82.66(24.97)	74.70(20.23)
Amount of bleeding, mean (SD), ml	41.86(52.46)	38.5(23.24)	35.04(46.20)	39.26(20.81)
Hospital stay, mean (SD), day	5.5(2.9)	5.2(1.3)	4.4(1.7)	4.5(1.5)
Dural tear, n (%)	2(5.71)	0	6(4.72)	2(1.74)
Wound infection, n (%)	0	1(3.33)	1(0.79)	4(3.48)
Repeated surgery within 2 y, n (%)	1(2.85)	0	4(3.15)	3(2.61)

Values are presented as the mean (SD) unless otherwise indicated. P<0.05 in duration of operation (group C vs. group D). SD: standard deviation.