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Table 4 Results of multivariate linear regression analysis

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

Coefficients Unstandardized SE Standardized t P
β β
Constant −251.2 154.265   −2.105 0.384
Age 2.548 0.851 0.103 4.021 0.000**
Number of fusion levels −46.325 15.541 −0.059 −2.054 0.015*
ASA classification 29.597 9.651 0.078 3.951 0.046*
Surgery time −1.954 0.318 −0.031 −0.895 0.017*
PBV 62.254 19.682 0.108 3.65 0.026*
TBL 1.542 0.133 0.382 3.951 0.001**
Postoperative Hb 3.542 0.951 0.005 0.651 0.72
Postoperative Hct −7.121 3.654 −0.082 −2.682 0.034*
Hb loss 1.654 1.955 0.016 0.984 0.534
Hct loss 42.652 15.698 0.216 3.934 0.005**
APTT −2.398 1.498 −0.038 −1.739 0.351
Fibrinogen −65.681 23.951 −0.235 −4.065 0.0278*
  1. Note: *P < 0.05, **P < 0.01
  2. ASA American Society of Anesthesiologists, Hct hematocrit, Hb hemoglobin, APTT activated partial thromboplastin time, TBL total blood loss, PBV patient’s blood volume