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Table 3 Results of the Pearson or Spearman correlation analysis

From: Analysis of risk factors for perioperative hidden blood loss in unilateral biportal endoscopic spine surgery: a retrospective multicenter study

Parameters Sig (two-tailed) P
Sex 0.065 0.489
Age 0.089 0.035*
BMI −0.054 0.321
Hypertension 0.651 0.684
Diabetes mellitus 0.183 0.495
Smoking 0.845 0.267
Drinking 0.254 0.516
Length of stay −0.087 0.154
Disease groups
 Lumbar disc herniation 0.065 0.125
 Lumbar stenosis 0.057 0.654
 Lumbar spondylolisthesis 0.054 0.054
Number of fusion levels 0.987 0.000**
Fusion level
 L3-L4 0.058 0.298
 L4-L5 0.168 0.698
 L5-S1 0.751 0.541
ASA classification 0.598 0.000**
Surgery time 0.824 0.039**
PBV 0.542 0.014*
TBL 0.982 0.002**
VBL 0.215 0.098
Preoperative Hb −0.069 0.058
Preoperative Hct −0.058 0.692
Postoperative Hb −0.534 0.000*
Postoperative Hct −0.845 0.000*
Hb loss 0.265 0.018*
Hct loss 0.726 0.038*
Preoperative ALB 0.315 0.641
PT −0.264 0.215
APTT −0.298 0.024*
Platelet 0.098 0.569
Fibrinogen −0.949 0.017*
  1. Note: *P < 0.05, **P < 0.01
  2. BMI body mass index, ASA American Society of Anesthesiologists, Hct hematocrit, Hb hemoglobin, ALB albumin, PT prothrombin time, APTT activated partial thromboplastin time, PLT platelet, TBL total blood loss, PBV patient’s blood volume, VBL visible blood loss