Statistical analysis
Variables are compared between caval thrombosis vs non-caval thrombosis and between worsening clot vs non-worsening clot below. Quantitative variables are summarized by median (inter-quartile range; IQR) and tested by the Wilcoxon rank sum test; Categorical variables are summarized by N (%) and tested by the Fisher exact test.
Variable correlations with caval thrombosis
Table 1: Variables by caval thrombosis (CT) status.
| Hypercoagulable Disorder - No |
470(96.7%) |
18(90%) |
0.1555 |
| Hypercoagulable Disorder - Yes |
16(3.3%) |
2(10%) |
|
| Filter Indication - Anticoagulation Failure |
41(8.4%) |
2(10%) |
0.0509 |
| Filter Indication - Calf DVT in neurosurgery patient |
19(3.9%) |
1(5%) |
|
| Filter Indication - DVT or PE with contraindication to anticoagulation |
363(74.7%) |
15(75%) |
|
| Filter Indication - Prophylactic |
56(11.5%) |
0(0%) |
|
| Filter Indication - Other |
7(1.4%) |
2(10%) |
|
| Dwell time (days) |
106.5 (70, 160) |
213 (105, 279) |
0.01 |
| Retrieval Intent - Non-Perm |
327(67.3%) |
15(75%) |
0.6275 |
| Retrieval Intent - Perm |
159(32.7%) |
5(25%) |
|
| Age (years) |
64 (53, 71) |
57 (49.8, 63.8) |
0.114 |
| Sex - Female |
201(41.4%) |
9(45%) |
0.8184 |
| Sex - Male |
285(58.6%) |
11(55%) |
|
| Clot Location - Calf |
31(6.4%) |
2(10%) |
0.5183 |
| Clot Location - Iliocaval |
21(4.3%) |
1(5%) |
|
| Clot Location - Iliocaval and pulmonary embolus |
5(1%) |
1(5%) |
|
| Clot Location - Leg |
196(40.3%) |
8(40%) |
|
| Clot Location - Leg and pulmonary embolus |
111(22.8%) |
3(15%) |
|
| Clot Location - Pulmonary embolus |
115(23.7%) |
5(25%) |
|
| Clot Location - Not applicable |
7(1.4%) |
0(0%) |
|
| Follow-up time (days) |
52.5 (9.8, 193.5) |
663 (218.5, 729) |
0.009 |
Variable correlations with worsening clot
Table 2: Variables by worsening clot (WC) status.
| Hypercoagulable Disorder - No |
440(96.5%) |
48(96%) |
0.6954 |
| Hypercoagulable Disorder - Yes |
16(3.5%) |
2(4%) |
|
| Filter Indication - Anticoagulation Failure |
39(8.6%) |
4(8%) |
0.667 |
| Filter Indication - Calf DVT in neurosurgery patient |
19(4.2%) |
1(2%) |
|
| Filter Indication - DVT or PE with contraindication to anticoagulation |
341(74.8%) |
37(74%) |
|
| Filter Indication - Prophylactic |
50(11%) |
6(12%) |
|
| Filter Indication - Other |
7(1.5%) |
2(4%) |
|
| Dwell time (days) |
106 (69.8, 154) |
160 (76, 240.5) |
0.018 |
| Retrieval Intent - Non-perm |
306(67.1%) |
36(72%) |
0.5281 |
| Retrieval Attempted - Perm |
150(32.9%) |
14(28%) |
|
| Age (years) |
64 (53, 71) |
61 (50.2, 69) |
0.204 |
| Sex - Female |
189(41.4%) |
21(42%) |
1 |
| Sex - Male |
267(58.6%) |
29(58%) |
|
| Clot Location - Calf |
28(6.1%) |
5(10%) |
0.3 |
| Clot Location - Iliocaval |
19(4.2%) |
3(6%) |
|
| Clot Location - Iliocaval and pulmonary embolus |
4(0.9%) |
2(4%) |
|
| Clot Location - Leg |
187(41%) |
17(34%) |
|
| Clot Location - Leg and pulmonary embolus |
104(22.8%) |
10(20%) |
|
| Clot Location - Pulmonary embolus |
108(23.7%) |
12(24%) |
|
| Clot Location - Not applicable |
6(1.3%) |
1(2%) |
|
| Follow-up time (days) |
56 (10.5, 226.2) |
182 (165, 340) |
0.153 |