Table 1 Baseline characteristics of the patients

Number of subjects

114

88

Mean age

60.1 ± 13.2

57.3 ± 12.6

0.130

Male/Female

65/49

54/34

0.534

Concomitant disease

 Hypertension

44(38.6%)

21(23.9%)

0.026

 Diabetes

18(15.8%)

7(8.0%)

0.094

 Coronary heart disease

10(8.8%)

6(6.8%)

0.610

 Cerebral infarction

11(9.7%)

4(4.6%)

0.170

Risk factors for VTE

 Transient risk factors

41(36.0%)

48(54.6%)

0.008

 History of VTE

25(21.9%)

9(10.2%)

0.028

 Cancer

28(24.6%)

16(18.2%)

0.276

 Thrombophilia

4(3.5%)

3(3.4%)

1.000

Type of VTE

 DVT only

98(86.0%)

82(93.2%)

0.103

 DVT and PE

16(14.0%)

6(6.8%)

Location of DVT

 Proximal

110(96.5%)

83(94.3%)

0.690

 Distal

4(3.5%)

5(5.7%)

Indication for IVCF insertion

 Contraindications to anticoagulation

46(40.3%)

34(38.7%)

0.476

 VTE with failure of anticoagulation

14(12.3%)

6(6.8%)

 Perioperative operation

19(16.7%)

20(22.7%)

 Thrombolysis

35(30.7%)

28(31.8%)

Filter type

 TrapEase filter (Cordis)

36(31.6%)

20(22.7%)

0.156

 OptEase filter (Cordis)

38(33.3%)

34(38.6%)

 G2 filter (Bard)

16(14.0%)

7(8.0%%)

 Aegisy filter (China)

24(21.1%)

27(30.7%)

Length of follow-up(months)

57.4 ± 20.8

62.2 ± 23.0

0.158