Table 1 Comparisons of baseline data and Perioperative parameter.
|  | High PLVI n = 169 | Low PLVI n = 145 | P value |
|---|---|---|---|
Baseline data | |||
 Age at surgery (year) | 69.6 ± 8.2 | 71.8 ± 10.8 | 0.90 |
 Gender (male/female) | 75/94 | 66/79 | 0.94 |
  BMI | 22.7 ± 5.8 | 20.2 ± 4.2 | 0.65 |
  BMD |  − 2.2 ± 0.6 |  − 2.4 ± 0.3 | 0.76 |
Perioperative parameter | |||
 Operation time (min) | 104.6 ± 10.6 | 96.3 ± 12.9 | 0.63 |
 Blood loss (ml) | 110.2 ± 22.3 | 98.8 ± 15.7 | 0.54 |
 Preoperative  Hemoglobin (g/L) | 132.8 ± 16.2 | 135.4 ± 14.9 | 0.86 |
 Postoperative Hemoglobin (g/L) | 96.3 ± 12.5 | 75.3 ± 14.5 | 0.02 |
 Blood transfusion volume (ml) | 54.6 ± 14.6 | 159.2 ± 21.3 | 0.0001 |
 Blood transfusion rate (%) | 29.5 | 48.9 | 0.02 |
Hospital stays (d) | 9.8 ± 4.9 | 15.5 ± 5.4 | 0.01 |
Number of surgical segments | |||
 L2-3 | 5 | 10 | 0.43 |
 L3-4 | 22 | 17 | 0.76 |
 L4-5 | 78 | 69 | 0.78 |
 L5-S1 | 64 | 49 | 0.59 |
