Table 2 Univariate analysis of factors associated with postoperative deep venous thrombosis (DVT)

Age > 51.5 year

Gender

 Male

 Female

Occupation

 Agricultural laborer

 Office clerk

Residence, rural area

35 (100.0)

6 (17.1)

29 (82.9)

21 (60.0)

14 (40.0)

16 (45.7)

310 (98.1)

93 (29.4)

223 (70.6)

252 (79.7)

64 (20.3)

176 (55.7)

0.411

0.125

0.008‡

0.260

Disease duration > 8.5 year

Comorbidities

 Hypertension

 Diabetes

19 (54.3)

21 (60.0)

4 (11.4)

114 (36.1)

144 (45.6)

40 (12.7)

0.035‡

0.105

0.835

Length of surgical incision (cm)

Operation time > 169 min

Intraoperative blood loss > 102 ml

BMI > 26.8 kg/m²

11.8 ± 0.5

21 (60.0)

20 (57.1)

30 (85.7)

11.9 ± 1.0

108 (34.2)

73 (23.1)

182 (57.6)

0.410

0.003‡

< 0.001‡

0.001‡

Preoperative-

 WBC (3.5–9.5*10⁹/L)

5.6 ± 1.5

5.9 ± 1.4

0.359

 RBC (3.8–5.1*10⁹/L)

 HGB (115–150* g/L)

 PLT (125–350*10⁹/L)

 D dimer > 0.29 mg/L

 Prothrombin time < 10.7 s

 INR < 0.98

 Length of hospitalization (day)

4.3 ± 0.4

131.4 ± 14.2

221.8 ± 44.7

24 (68.6)

10 (28.6)

14 (40.0)

11.7 ± 3.9

4.3 ± 0.4

132.8 ± 15.0

239.2 ± 64.4

121 (38.3)

150 (47.5)

186 (58.9)

13.1 ± 4.6

0.446

0.594

0.121

0.001‡

0.033‡

0.032‡

0.087