Learning Curve and Clinical Outcome of Biportal Endoscopic-Assisted Lumbar Interbody Fusion

Table 4

Other clinical outcome measures divided by group. Statistical analysis between the two groups by chi-square test, fisher’s exact test, or two sample -test ( value < 0.05).

Variables		Total	Group A	Group B	value
Modified Macnab criteria	1	32 (56.1%)	15 (26.3%)	17 (29.8%)	0.143
	2	18 (31.6%)	14 (24.6%)	4 (7.0%)
	3	6 (10.5%)	4 (7.0%)	2 (3.5%)
	4	1 (1.8%)	1 (1.8%)	0 (0.0%)
Complication	Y	3 (5.3%)	2 (3.5%)	1 (1.8%)	0.799
	N	54 (94.7%)	32 (56.1%)	22 (38.6%)
Bridwell grade	1	41 (71.9%)	21 (36.8%)	20 (35.1%)	0.098
	2	14 (24.6%)	11 (19.3%)	3 (5.3%)
	3	2 (3.5%)	2 (3.5%)	0 (0.0%)
Revision	Y	2 (3.5%)	1 (1.8%)	1 (1.8%)	0.777
Postoperative drain amount (ml)					0.460
Time to ambulation (hours)					≤0.001
Length of stay (days)					0.696