Odds ratios for venous thrombosis (adjusted for age and sex) for total number of risk factors present per individual
| . | Cases, n . | Control, n . | All, OR (CI95) . | Air travelers, OR (CI95) . | Other travelers, OR (CI95) . |
|---|---|---|---|---|---|
| Number of laboratory risk factors* | |||||
| 0 | 45 | 82 | 1† | 1† | 1† |
| 1 | 99 | 42 | 4.3 (2.6-7.2) | 3.1 (1.4-7.1) | 5.4 (2.7-10.8) |
| ≥ 2 | 56 | 10 | 10.0 (4.7-21.7) | 36.4 (4.4-298) | 7.3 (3.0-17.6) |
| Total number of risk factors‡ | |||||
| 0 | 12 | 48 | 1† | 1† | 1† |
| 1 | 54 | 48 | 4.4 (2.1-9.2) | 2.9 (0.9-9.6) | 5.8 (2.2-15.4) |
| 2 | 54 | 28 | 7.4 (3.4-16.3) | 7.5 (2.2-25.9) | 8.0 (2.9-22.4) |
| 3 | 60 | 7 | 32.1 (11.7-88.2) | 22.9 (7.2-73.3) | |
| 4-7 | 20 | 3 | 23.9 (6.0-95.0) | 16.8 (3.7-77.1) | |
| . | Cases, n . | Control, n . | All, OR (CI95) . | Air travelers, OR (CI95) . | Other travelers, OR (CI95) . |
|---|---|---|---|---|---|
| Number of laboratory risk factors* | |||||
| 0 | 45 | 82 | 1† | 1† | 1† |
| 1 | 99 | 42 | 4.3 (2.6-7.2) | 3.1 (1.4-7.1) | 5.4 (2.7-10.8) |
| ≥ 2 | 56 | 10 | 10.0 (4.7-21.7) | 36.4 (4.4-298) | 7.3 (3.0-17.6) |
| Total number of risk factors‡ | |||||
| 0 | 12 | 48 | 1† | 1† | 1† |
| 1 | 54 | 48 | 4.4 (2.1-9.2) | 2.9 (0.9-9.6) | 5.8 (2.2-15.4) |
| 2 | 54 | 28 | 7.4 (3.4-16.3) | 7.5 (2.2-25.9) | 8.0 (2.9-22.4) |
| 3 | 60 | 7 | 32.1 (11.7-88.2) | 22.9 (7.2-73.3) | |
| 4-7 | 20 | 3 | 23.9 (6.0-95.0) | 16.8 (3.7-77.1) | |
High (> P80) FII, FVIII, FVL mutation, and/or prothrombin mutation.
Reference category, traveling individuals in whom all coagulation factors are normal and in whom the clinical factors were absent.
Any of the prothrombotic factors mentioned above, as well as oral contraceptives, positive family history (at least 1 thrombotic event in a parent, brother, or sister) and BMI (third tertile as compared to first). The cutoff values for tertiles of BMI were 23.7 and 26.9.