Study population characteristics
| Variable | VTE | IDDM |
| N | 5065 | 6609 |
| Mean age (SD) | 25.7 (5.2) | 23.7 (6.5) |
| Age group, n (%) | ||
| 13–25 years | 2258 (44.6) | 3627 (54.9) |
| 26–33 years | 2807 (54.4) | 2982 (45.1) |
| Females, n (%) | 3470 (68.5) | 2516 (38.1) |
| Risk factor for VTE, yes, n (%) | 1179 (23.3) | 449 (6.8) |
| Trauma | 618 (12.2) | 267 (4.0) |
| Surgery | 652 (12.9) | 156 (2.4) |
| Cancer | 64 (1.3) | 16 (0.2) |
| Inflammatory bowel disease | 49 (1.0) | 26 (0.7) |
| Rheumatoid arthritis | 8 (0.1) | 5 (0.1) |
| DVT, n (%) | 3881 (76.6) | – |
| PE, n (%) | 1184 (23.4) | – |
DVT, deep venous thrombosis; IDDM, insulin-dependent diabetes mellitus; PE, pulmonary embolism; VTE, venous thromboembolism.