Table 3 Baseline characteristics of non-DVT group vs. DVT group.

Surgical site(Knee)

131(48.5%)

37(78.7%)

< 0.0001

98(49.0%)

29(76.3%)

0.002*

33(47.1%)

8(88.9%)

0.045

Gender(Female)

204(75.6%)

40(85.1%)

0.151

149(74.5%)

33(86.8%)

1

55(78.6%)

7(77.8%)

1

Age

41–60

82

6

0.029*

59

6

0.187

23

0

0.72

61–74

122

35

0.001*

95

27

0.026*

27

8

0.017*

≥ 75

49

4

0.201

33

3

0.362

16

1

0.507

BMI ≥ 25

118(43.7%)

30(63.8%)

0.01*

81(40.5%)

24(63.2%)

0.032*

37(52.8%)

6(66.7%)

0.703

Malignancy

12(4.4%)

3(6.4%)

0.837

8(4.0%)

3(7.8%)

0.531

4(5.7%)

0

1

Varicose vein

4(1.5%)

0

1

2(1.0%)

0

1

2(2.9%)

0

1

Positive blood test

10(3.7%)

0

0.368

7(3.5%)

0

0.518

3(4.3%)

0

1

History of DVT

2(0.7%)

0

1

2(1.0%)

0

1

0

0

-

Smoking

21(7.8%)

3(6.4%)

0.972

15(7.5%)

2(5.3%)

0.883

6(8.6%)

1(11.1%)

0.586

Diabetes need insulin

4(1.5%)

0

1

4(2.0%)

0

1

0

0

-

HRT

32(11.9%)

1(2.1%)

0.04*

23(11.5%)

1(2.6%)

0.171

9(12.9%)

0

0.558

Frature of the Hip

28(10.4%)

5(10.6%)

0.956

17(8.5%)

4(10.5)

0.927

11(15.7%)

1(11.1%)

1

Bed for 72h

43(15.9)

10(21.3%)

0.364

29(14.5%)

8(21.1%)

0.307

14(20.0%)

2(22.2%)

1

Blood Transfusion

98(36.3%)

15(31.9%)

0.563

68(34.0%)

11(28.9%)

0.544

30(42.6%)

4(44.4%)

1

CVC

8(3.0%)

1(2.1%)

1

6(3.0%)

1(2.6%)

1

2(2.9%)

0

1

Leg swelling

64(23.7%)

28(59.6%)

< 0.0001*

47(23.5%)

21(55.3%)

< 0.0001*

17(24.3%)

7(77.8%)

< 0.0001*

COPD

1(0.4%)

2(4.3%)

0.059

1(0.5%)

1(2.6%)

0.294

0

1(11.1%)

0.114

Protopathy

129/9/51/31/30/20

31/4/2/3/5/2

0.036*

99/7/38/25/19/12

24/3/2/3/4/2

0.232

30/2/13/6/11/8

7/1/0/0/1/0

0.214

TAT

21.6 ± 13.8

47.4 ± 27.6

< 0.0001*

21.8 ± 13.3

41.4 ± 22.0

< 0.0001*

20.9 ± 15.1

72.5 ± 35.4

< 0.0001*

D-dimer

10.8 ± 10.6

20.5 ± 18.2

< 0.0001*

10.9 ± 10.8

18.9 ± 17.4

< 0.0001*

10.7 ± 9.8

28.3 ± 21.0

< 0.0001*