Table 5 Multiple linear analysis of clinical characteristics for the amount of intraoperative blood loss before and after propensity score analysis

(Intercept)

-0.541

0.770

0.578

0.854

Smoking

 No

Ref.

Ref.

 Yes

1.410

0.001

1.443

0.010

Primary tumor type

 Slow

Ref.

Ref.

 Moderate

-0.093

0.840

0.932

0.223

 Rapid

-1.225

0.007

-0.644

0.446

Age

0.008

0.658

-0.029

0.355

Gender

 Male

Ref.

Ref.

 Female

0.241

0.583

-1.158

0.410

BMI

-0.066

0.086

-0.091

0.209

Diabetes

 No

Ref.

Ref.

 Yes

0.169

0.745

0.989

0.338

Hypertension

 No

Ref.

Ref.

 Yes

0.231

0.566

1.250

0.065

Preoperative chemotherapy

 No

Ref.

Ref.

 Yes

-1.096

0.041

-1.456

0.182

Extravertebral bone metastasis

 No

Ref.

Ref.

 Yes

-0.539

0.156

0.301

0.650

Visceral metastases

 No

Ref.

Ref.

 Yes

0.021

0.964

-0.040

0.961

KPS

 > 50

Ref.

Ref.

 ≤50

0.216

0.585

-1.038

0.144

Preoperative embolization

 No

Ref.

Ref.

 Yes

-0.408

0.597

-1.561

0.199

Surgical process

 Palliative decompression

Ref.

Ref.

 Partial resection of vertebrae

1.441

0.034

-0.517

0.789

 En bloc resection of vertebrae

1.506

0.042

3.321

0.009

Surgical site

 Cervical and cervical thoracic

Ref.

Ref.

 Thoracic and thoracolumbar

0.223

0.776

0.356

0.777

 Lumbar and lumbosacral

0.763

0.364

1.797

0.210

Number of surgical segments

1

Ref.

Ref.

 ≧ 2

0.851

0.027

1.836

0.017

Hypoalbuminemia

 No

Ref.

Ref.

 Yes

-0.219

0.685

-0.321

0.697

Thrombocytopenia

 No

Ref.

Ref.

 Yes

-15.088

0.986

-14.605

0.991

PT

 <12

Ref.

Ref.

 ≥12

0.428

0.317

0.929

0.242

APTT

 <32

Ref.

Ref.

 ≥32

1.110

0.008

1.435

0.045