Table 2.
Variables related to surgery
| Variable | UBE-ULBD | UBE-LD | p-value | χ2 | t | Z |
|---|---|---|---|---|---|---|
| Operating time (min) | 160.38 ± 53.98 | 123.68 ± 26.59 | 0.000 | - | 5.878 | |
| EBL (mL) | 100 (50–100) | 50 (50–100) | 0.125 | - | - | 1.532 |
| Postoperative hospital stays (day) | 6.36 ± 2.04 | 5.97 ± 2.91 | 0.276 | - | 1.092 | - |
| Approach side (n) | 0.707 | 0.141 | ||||
| Left | 67 | 54 | - | - | ||
| Right | 40 | 36 | - | - | ||
| Surgical failure | 7 (6.54) | 5 (5.56) | 0.773 | 0.083 | - | - |
Values are presented as mean±standard deviation, median (interquartile range), or number (%).
UBE-ULBD, unilateral biportal endoscopy unilateral laminotomy bilateral decompression; UBE-LD, unilateral biportal endoscopy lumbar discectomy; EBL, estimated blood loss.