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Table 1 Comparison of preoperative variables between the two groups

From: Development and validation of a nomogram to predict perioperative blood transfusion in patients undergoing total knee arthroplasty

 

Transfusion(n = 391)

Non-transfusion(n = 5011)

t/z/χ2

P

Age, years

67 (61,72)

66 (61,71)

1.656

0.098

Sex

  

17.307

0.000

 Male

57

1192

  

 Female

334

3819

  

BMI, Kg/m2

26.04 (23.52,29.14)

27.34 (24.88,29.69)

5.292

0.000

Duration of disease, years

  

11.731

0.008

 <1

19

251

  

 1–3

29

562

  

 3–10

125

1816

  

 >10

218

2382

  

Smoking

28

503

3.387

0.066

Alcohol

24

553

9.119

0.003

Allergies

65

754

0.701

0.402

Transfusion history

58

294

47.872

0.000

Blood type (Rh)

  

0.000

1.000

 Rh+

389

4990

  

 Rh-

2

21

  

Blood type (ABO)

  

3.748

0.290

 A

101

1493

  

 B

121

1540

  

 O

124

1401

  

 AB

45

577

  

 CCI

3 (2,3)

3 (2,3)

1.065

0.287

Indications

   

0.155*

 Osteoarthritis

372

4835

  

 Rheumatoid arthritis

16

151

  

 Traumatic arthritis

3

10

  

 Psoriatic arthritis

0

6

  

 Others

0

9

  

Procedures

  

653.561

0.000

 Bilateral TKA

231

570

  

 Unilateral TKA

160

4441

  

TXA use

130

2060

9.345

0.002

Comorbidities

 Hypertension

186

2549

1.578

0.209

 Diabetes mellitus

68

801

0.532

0.466

 Coronary heart disease

67

687

3.544

0.060

 Arrhythmia

9

139

0.303

0.582

 Heart failure

1

6

 

0.471*

 Other cardiac diseases

8

78

0.555

0.456

 Peripheral vascular disease

8

114

0.086

0.769

 Cerebrovascular disease

38

342

4.644

0.031

 Mental illness

3

45

0.070

0,791

 Pulmonary disease

9

180

1.789

0.181

 Digestive system disease

22

359

1.308

0.253

 Urinary system diseases

5

121

2.054

0.152

 Gynecologic diseases

12

149

0.011

0.915

Laboratory tests

 RET, 109/μl

61 (57,78)

64 (52,78)

3.517

0.000

 MCV, fL

89.5 (86.4,92.6)

89.4 (86.7,92.2)

0.257

0.797

 MCH, Pg

29.7 (28.6,30.7)

29.9 (28.9,30.9)

2.291

0.022

 MCHC, g/L

332.0 (324.0,340.0)

333.0 (327.0,341.0)

3.563

0.000

 Hb, g/L

80.0 (74.0,91.0)

105.0 (95.00,115.0)

23.463

0.000

 RDW, %

13.0 (12.5,13.7)

12.8 (12.4,13.3)

23.046

0.000

 PLT, 109/L

146.0 (121.0,179.0)

179.0 (149.0,213.0)

11.825

0.000

 PDW, fL

11.7 (10.8,13.2)

11.8 (10.8,13.0)

0.452

0.651

  1. TKA Total knee arthroplasty, BMI Body mass index, CCI Charlson comorbidity index, TXA Tranexamic acid, RET Reticulocyte, MCV Mean corpuscular volume, MCH Mean corpuscular hemoglobin, MCHC Mean corpuscular hemoglobin concentration, Hb Hemoglobin, RDW Red blood cell distribution width, PLT Platelet, PDW Platelet distribution width
  2. *Fisher's exact test