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Table 4 Results of multivariate linear regression for hidden blood loss

From: Hidden blood loss and its possible risk factors in minimally invasive transforaminal lumbar interbody fusion

Coefficientsa

Unstandardized

Standardized

β

SE

β

t

P

Constant

− 145.312

135.160

 

− 1.075

0.284

Age

3.279

0.907

0.106

3.616

0.000

Surgical duration

− 0.154

0.209

− 0.028

− 0.739

0.461

Muscle thickness

5.683

1.754

0.127

3.241

0.002

Subcutaneous fat thickness

− 1.487

1.564

− 0.026

− 0.951

0.344

ASA classification

32.196

11.528

0.101

2.793

0.006

PBV

58.611

18.259

0.139

3.210

0.002

TBL

0.279

0.091

0.313

3.071

0.003

Postoperative Hct

− 5.062

2.531

− 0.077

− 2.001

0.048

Postoperative Hb

0.150

0.404

0.008

0.370

0.712

Hct loss

39.861

13.592

0.283

2.933

0.004

Hb loss

0.860

1.060

0.023

0.811

0.419

APTT

− 1.867

1.579

− 0.040

− 1.183

0.239

Fibrinogen

− 72.723

15.446

− 0.199

− 4.708

0.000

Level fused

− 33.994

18.593

− 0.066

− 1.828

0.070

  1. Values in bold indicate statistical significance
  2. ASA American Society of Anesthesiologists, PBV patient’s blood volume, HBL hidden blood loss, TBL total blood loss, Hct hematocrit, Hb hemoglobin, APTT activated partial thromboplastin time
  3. aDependent variable: HBL (ml)