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Table 4 Univariate analysis of categorical variables with interest

From: Age over 65 years and high levels of C-reactive protein are associated with the risk of preoperative deep vein thrombosis following closed distal femur fractures: a prospective cohort study

Variables

Number (%) of patients without DVT (n = 76)

Number (%) of patients with DVT (n = 84)

p value

Gender (males)

26(34.2)

33(39.3)

0.506

Age (> 65 years)

11(14.5)

40(47.6)

< 0.001*

BMI (kg/m2)

  

0.573

 < 18.5

1(1.3)

1(1.2)

 

 18.5–23.9

26(34.2)

22(26.2)

 

 24.0–27.9

29(38.2)

41(48.8)

 

 ≥ 28.0

20(26.3)

20(23.8)

 

Living place (rural)

51(67.1)

53(63.1)

0.595

Diabetes mellitus

20(26.3)

20(23.8)

0.715

Hypertension

21(27.6)

25(29.8)

0.766

Cardiovascular diseases

14(18.4)

15(17.9)

0.926

Previous surgery in any site

29(38.2)

22(26.2)

0.105

Smoking

6 (7.9)

8(9.5)

0.716

Alcohol consumption

6(7.9)

11(13.1)

0.286

Injury mechanisms (high energy)

29(38.2)

50(59.5)

0.007*

Fracture side (left)

45(59.2)

48(57.1)

0.791

Concurrent fractures (≥ 2 sites)

14(18.4)

20(23.8)

0.405

Fracture classification

  

0.578

 Type A

44(57.9)

49(58.3)

 

 Type B

11(14.5)

8(9.5)

 

 Type C

21(27.6)

27(32.1)

 

ASA score

  

0.001*

 I–II

59(77.6)

43(51.2)

 

 III–V

14(22.4)

41(48.8)

 

HGB (< lower limit)

23(30.3)

37(40.0)

0.072

RBC (< lower limit)

44(57.9)

58(69.0)

0.143

WBC (> 10 × 109/L)

31(40.8)

31(36.9)

0.614

PLT (> 217 × 109/L)

38(50.0)

59(70.2)

0.009*

TP (< 60 g/L)

36(47.4)

44(52.4)

0.527

ALB (< 35 g/L)

34(44.7)

45(53.6)

0.264

ALT (> 21.5 U/L)

30(39.5)

48(57.1)

0.026*

AST (> 18.5 U/L)

36(47.7)

57(67.9)

0.009*

CRP (> 11 mg/L)

31(40.8)

72(85.7)

0.001*

PT (> 12.5 s)

10(13.2)

13(15.5)

0.676

APTT (<28 s)

25(32.9)

38(45.2)

0.111

FIB (> 4.4 g/L)

11(14.5)

18(21.4)

0.254

D-dimer (> 1.0 mg/L)

25(32.9)

59(70.2)

< 0.001*

  1. *Statistical significance
  2. DVT deep vein thrombosis, BMI body mass index, ASA the American Society of Anesthesiologists, HGB hemoglobin, reference range: female, 110–150 g/L, male, 120–160 g/L; RBC red blood cell, reference range: female, 3.5–5.0 × 1012/L, male, 4.0–5.5 × 1012/L, WBC white blood cell, PLT platelet, TP total protein, ALB albumin, ALT alanine transaminase, AST aspartate transaminase; CRP C-reactive protein, PT prothrombin time, APTT activated partial thromboplastin time, FIB fibrinogen