Table 2.
Demographics, clinical characteristics.
| Variables | VTE group | Non-VTE group | Odds ratio | 95% CI | p-value |
|---|---|---|---|---|---|
| Number of patients | 14 (3.5%) | 388 (96.5%) | |||
| Male | 6 (1.5%) | 227 (56.5%) | 0.530 | 0.181–1.563 | 1.358 |
| Female | 8 (1.0%) | 161 (40%) | 1.880 | 0.640–5.522 | 1.358 |
| Age (years) | 54.3 (45.1–68.4) | 34.4 (23.0–52.5) | 1.065 | 1.029–1.103 | < 0.001 |
| BMI (kg/cm2) | 28.4 (26.0–29.4) | 23.5 (21.3–27.0) | 1.129 | 1.029–1.24 | 0.001 |
| ISS | 13 (8.3–17.5) | 9 (9–20) | 1.012 | 0.965–1.061 | 0.587 |
| Time to surgery (days) | 8 (6–10) | 7 (5–9) | 1.046 | 0.923–1.185 | 0.300 |
| Surgery duration (min) | 205 (153–219) | 168 (129–235) | 1.002 | 0.996–1.008 | 0.267 |
| Blood loss (ml) | 600 (425–737) | 300 (100–700) | 1.000 | 0.999–1.001 | 0.071 |
| Patients with multiple fractures | 7 (17.4%) | 209 (52.6%) | 0.856 | 0.295–2.295 | 0.776 |
| Blood transfused (unit) | |||||
| PRBC | 6 (4.0–11.5) | 4 (4.0–10.0) | 1.036 | 0.987–1.087 | 0.089 |
| FFP | 2 (2.0–7.0) | 2 (2.0–6.0) | 1.02 | 0.942–1.104 | 0.098 |
| Pelvic fracture | 6 (1.5%) | 212 (52.7%) | 0.623 | 0.212–1.828 | 0.385 |
| Acetabular fracture | 4 (1.0%) | 121 (30.1%) | 0.883 | 0.271–2.870 | 1.000 |
| Both fracture | 4 (1.0%) | 55 (13.7%) | 2.422 | 0.734–7.993 | 0.134 |
| d-dimer (ng/ml) | |||||
| Pre-op > 10,000 | 10 (2.5%) | 152 (37.8%) | 3.882 | 1.196–12.598 | 0.016 |
| Post-op > 10,000 | 9 (2.2%) | 126 (31.3%) | 3.743 | 1.229–11.399 | 0.013 |
Continuous variables are presented as median (IQR) and analysed using the Mann–Whitney U test for p-values and using the univariate logistic regression test for odds ratios and 95% CIs. Categorical variables are presented as number (percentage of 402 patients) and analysed with Fisher’s exact or Chi-square test for p-value, odds ratios, and 95% CIs. BMI, body mass index; ISS, injury severity score; PRBC, packed red blood cell; FFP, fresh frozen plasma; CI, confidence interval.