| Delay in clinical presentation | p-value | ||
| ≤7 days | >7 days | ||
| Subjects n | 869 | 196 | |
| Age years | 51±17 | 54±18 | 0.009 |
| Male | 342 (39.4) | 79 (40.3) | 0.806 |
| Inpatient | 149 (17.2) | 22 (11.2) | 0.041 |
| COPD | 69 (7.9) | 25 (12.8) | 0.032 |
| Heart failure | 40 (4.6) | 12 (6.1) | 0.373 |
| VTE risk factors | |||
| Immobilisation >3 days or major surgery <4 weeks | 175 (20.1) | 24 (12.2) | 0.010 |
| Active malignancy | 119 (13.7) | 22 (11.2) | 0.357 |
| History of VTE | 67 (7.7) | 20 (10.2) | 0.249 |
| Oestrogen use | 127 (14.6) | 22 (11.2) | 0.217 |
Data are presented as mean±sd or n (%), unless otherwise stated. COPD: chronic obstructive pulmonary disease; VTE: venous thromboembolism.