Table 2

Surgical features of patients undergoing biportal endoscopic lumbar surgery.

Variable	Outpatient	Inpatient	Total	P Value^{^a}
Variable	n = 58	n = 26	N = 84	P Value^{^a}
Number of levels
1 Level	51 (88%)	16 (62%)	67 (80%)	0.013
2 Levels	7 (12%)	10 (38%)	17 (20%)
Levels addressed^{^b}
L1–2	1 (2%)	1 (3%)	2 (2%)	0.170
L2–3	6 (9%)	2 (6%)	8 (8%)
L3–4	9 (14%)	11 (31%)	20 (20%)
L4–5	32 (49%)	18 (50%)	50 (50%)
L5–S1	17 (26%)	4 (11%)	21 (21%)
Primary diagnosis
Stenosis	26 (45%)	24 (92%)	50 (60%)	0.0001
Disc herniation	32 (55%)	2 (8%)	34 (40%)
Primary procedure
Discectomy	32 (55%)	2 (8%)	34 (40%)	0.0001
Laminotomy/decompression	26 (45%)	24 (92%)	50 (60%)

↵a Adjusted threshold for statistical significance, P < 0.0125.
↵b Total number of levels addressed was 65 for outpatients, 36 for inpatients, and 101 for all patients.