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Table 1 Single-variable analysis results of factors for the development of deep vein thrombosis

From: Risk factors for deep vein thrombosis even using low-molecular-weight heparin after total knee arthroplasty

Factor

Positive

Negative

p value

Deep vein thrombosis

22

81

 

Gender

Male

4

8

0.279*

Female

18

73

Age (years)

< 65

3

21

0.773**

≥ 65 to < 75

16

35

≥ 75

3

25

Unilateral/bilateral

Unilateral

15

74

0.005**a

Bilateral

7

7

Body mass index (kg/m2)

< 25

5

38

0.043**a

≥ 25 to < 30

13

35

≥ 30

4

8

Type of anesthesia

Epidural

3

37

0.006*a

General

19

44

Hypertension

+

18

48

0.078*a

–

4

33

Diabetes

+

3

20

0.389*

–

19

61

Hypercholesterolemia

+

4

9

0.468*

–

18

72

Prothrombin time/international normalized ratio

< 0.95

8

29

0.554**

≥ 0.95 to < 1.00

8

22

≥ 1.00 to < 1.05

4

19

≥ 1.05

2

11

  1. *Fisher’s exact test
  2. **Pearson’s chi-square test
  3. aSignificant relationship in single-variable analysis (p < 0.2)