Table 4.
Logistic regression model evaluating association of clinical and study methodology factors with VTE
| Variable | OR | 95% CI | P |
|---|---|---|---|
| Screening method | |||
| Usual clinical care | 1.0* | ||
| Screening ultrasound | 390 | 200–761 | <0.0001 |
| VTE outcomes reported | |||
| PE only | 1.0 | ||
| DVT only | 23 | 10–52 | <0.0001 |
| All VTE (PE and DVT) | 21 | 16–27 | <0.0001 |
| Mean travel duration | |||
| Less than 6 h | 0.011 | 0.0019–0.11 | <0.0001 |
| 6–8 h | 1.0 | ||
| More than 8 h | 2.3 | 1.4–3.6 | <0.0001 |
| Clinical VTE risk† | |||
| Lower | 1.0 | ||
| Higher | 3.6 | 2.2–5.8 | <0.0001 |
P compared to reference category.
VTE venous thromboembolism, DVT deep venous thrombosis, PE pulmonary embolism, OR odds ratio, CI confidence interval.
*Reference category.
†See Table 2 for description of risk categories.