| Risk Factor | Frequency | Percentage |
| Previous VTE (except a single event related to major surgery) | 0 | 0 |
| Previous VTE provoked by major surgery | 0 | 0 |
| Known high-risk thrombophilia | 0 | 0 |
| Medical comorbidities | 0 | 0 |
| Family history of unprovoked or oestrogen-related VTE in first-degree relative | 0 | 0 |
| Known low-risk thrombophilia (no VTE) | 0 | 0 |
| Age (>35 years) | 50 | 12.37 |
| Obesity (BMI > 30) | 49 | 12.12 |
| Obesity (BMI > 40) | 0 | 0 |
| Parity ≥ 3 | 62 | 15.34 |
| Smoker | 0 | 0 |
| Pre-eclampsia in current pregnancy | 6 | 1.5 |
| Multiple pregnancy | 3 | 0.74 |
| Caesarean section in labour | 21 | 5.19 |
| Elective caesarean section | 103 | 25.49 |
| Mid-cavity or rotational operative delivery | 0 | 0 |
| Prolonged labour (>24 hours) | 0 | 0 |
| PPH (>1 litre or transfusion) | 13 | 3.21 |
| Preterm birth < 37 + 0 weeks in current pregnancy | 27 | 6.68 |
| Any surgical procedure in pregnancy or puerperium except immediate repair of the perineum, | 0 | 0 |
| Current systemic infection | 5 | 1.23 |
| Immobility, dehydration | 0 | 0 |