Table 2. Surgical features of patients undergoing biportal endoscopic lumbar surgery.

Variable	No TXA (n=39)	TXA (n=45)	Total (n=84)	P value†
Number of levels, n [%]				0.83
1 level	32 [82]	35 [78]	67 [80]
2 levels	7 [18]	10 [22]	17 [20]
Levels addressed‡, n [%]				0.87
L1–2	1 [2]	1 [2]	2 [2]
L2–3	5 [11]	3 [5]	8 [8]
L3–4	9 [20]	11 [20]	20 [20]
L4–5	21 [46]	29 [53]	50 [50]
L5–S1	10 [22]	11 [20]	21 [21]
Primary diagnosis, n [%]				0.92
Stenosis	23 [59]	25 [56]	48 [57]
Disc herniation	16 [41]	20 [44]	36 [43]
Primary procedure, n [%]				0.92
Discectomy	16 [41]	20 [44]	36 [43]
ULBD	23 [59]	25 [56]	48 [57]

^†, adjusted threshold for statistical significance, P<0.0125; ^‡, total number of levels addressed for no TXA is 46, TXA is 55, and 101 for all patients. TXA, tranexamic acid; ULBD, unilateral laminotomy, bilateral decompression.