Table 1.
Patients’ demographic information
| Variable | ULIF | O-TLIF | P-value |
|---|---|---|---|
| Number of patients | 53 | 53 | |
| Gender (Male/Female) | 23/30 | 30/23 | 0.174 |
| Age (year) | 54.79 ± 8.54 | 54.92 ± 12.03 | 0.948 |
| Weight (kg) | 64.87 ± 11.52 | 65.24 ± 17.21 | 0.897 |
| Height (m) | 1.63 ± 0.073 | 1.65 ± 0.096 | 0.249 |
| BMI (kg/m2) | 24.19 ± 3.30 | 23.74 ± 4.92 | 0.578 |
| Preoperative diagnosis | |||
| Lumbar spinal stenosis | 47 | 51 | 0.141 |
| Spondylolisthesis | 6 | 2 | |
| Level of fusion | |||
| L2-L3 | 1 | 0 | 0.795 |
| L3-L4 | 3 | 3 | |
| L4-L5 | 29 | 29 | |
| L5-S1 | 20 | 21 | |
| ASA classification | |||
| I | 35 | 29 | 0.233 |
| II | 18 | 24 | |
| Fibrinogen level | 2.86 ± 0.58 | 2.83 ± 0.59 | 0.813 |
| Patient’s blood volume (ml) | 4008.11 ± 626.59 | 4092.18 ± 833.09 | 0.558 |
| Preoperative haematocrit (%) | 39.49 ± 4.44 | 40.85 ± 4.26 | 0.110 |
| Preoperative hemoglobin (g/L) | 133.02 ± 18.14 | 138.04 ± 15.56 | 0.129 |
| Preoperative red blood cells (10^12/L) | 4.48 ± 0.45 | 4.49 ± 0.48 | 0.913 |
| Incidence of pre-operative anemia | 24.53% | 20.75% | 0.643 |
Open transforaminal lumbar interbody fusion O-TLIF, Unilateral biportal endoscopic transforaminal lumbar interbody fusion ULIF, BMI Body mass index, American Society of Anesthesiologists ASA. Data are mean ± standard deviation; *P < 0.05