Characteristics of the study population
| Characteristic | Patients (n=219) |
| Mean age | 29.3 years |
| Mean BMI | 27.9 kg/m2 |
| Mean heart rate | 97.8/min |
| Mean respiratory rate | 18.9/min |
| Mean oxygen saturation | 97.8% |
| Mean systolic blood pressure | 120.7 mm Hg |
| Mean diastolic blood pressure | 71.9 mm Hg |
| Mean temperature | 36.5°C |
| Smoking status | |
| Never | 150 (68.5%) |
| Gave up before | 28 (12.8%) |
| Gave up during | 15 (6.8%) |
| Current | 26 (11.9%) |
| One or more previous pregnancies <24 weeks | 86 (39.3%) |
| One or more previous pregnancy >24 weeks | 137 (62.6%) |
| Family history of thrombosis | 41 (18.7%) |
| History of varicose veins | 18 (8.2%) |
| History of intravenous drug use | 1 (0.5%) |
| Known thrombophilia | 6 (2.7%) |
| Surgery in previous 4 weeks | 1 (0.5%) |
| Significant injury in the previous 4 weeks | 1 (0.5%) |
| History of thrombosis | 17 (7.8%) |
| First trimester | 20 (9.1%) |
| Second trimester | 81 (37.0%) |
| Third trimester | 118 (53.9%) |
| Multiple pregnancy | 11 (5.0%) |
| Long-haul travel during pregnancy | 20 (9.1%) |
| Three or more days of immobility/bed rest | 13 (5.9%) |
BMI, body mass index.