Table 2.
Characteristics of patients with VTE events at the time of VTE diagnosis within the separate cohorts and in the merged STAC cohort
| Tromsø 4 | HUNT 2 | DCH | STAC | |
|---|---|---|---|---|
| Subjects with VTE | 664 | 989 | 791 | 2,444 |
| Age at VTE diagnosis | 69 (44–88) | 69 (41–88) | 65 (56–74) | 68 (45–87) |
| Sex (men) | 46.7 (310) | 47.9 (474) | 56.4 (446) | 50.3 (1,230) |
| VTE type | ||||
| PEa | 42.8 (284) | 38.7 (383) | 41.2 (326) | 40.6 (993) |
| DVTa | 57.2 (380) | 61.3 (606) | 54.5 (431) | 58.0 (1,417) |
| Unprovoked VTEb | 44.9 (298) | 52.0 (514) | 49.9 (367) | 49.4 (1,179) |
| Provoked VTEb | 55.1 (366) | 48.0 (475) | 50.1 (369) | 50.6 (1,210) |
| Provoking factorsb | ||||
| Overt cancer | 22.9 (152) | 15.7 (155) | 19.7 (156) | 18.9 (463) |
| Surgery | 14.3 (95) | 17.1 (169) | 11.4 (84) | 14.6 (348) |
| Trauma | 7.7 (51) | 10.4 (103) | 0 | 6.4 (154) |
| Acute medical condition | 14.3 (95) | N/A | 10.2 (75) | 7.1 (170) |
| Immobilization | 17.6 (117) | 16.3 (161) | 11.1 (82) | 15.1 (360) |
| Travel | 0.9 (6) | 2.5 (25) | 5.7 (42) | 3.1 (73) |
| Other factor | 5.1 (34) | 5.4 (53) | 5.7 (42) | 4.1 (129) |
Notes: Values are percentages with absolute numbers in parentheses or mean with 5–95% ranges in parentheses.
There are 34 subjects in the DCH Study with missing information for PE and DVT;
several subjects have more than one provoking factor. The given percentages of unprovoked VTE, provoked VTE, and each provoking factor are among total VTE events in each study with exclusion of 55 events with missing information on provoking factors in the DCH Study.
Abbreviations: STAC, Scandinavian Thrombosis and Cancer; DCH, Danish Diet, Cancer and Health Study; HUNT 2, second Nord-Trøndelag Health Study; VTE, venous thromboembolism; DVT, deep venous thrombosis; PE, pulmonary embolism; N/A, not applicable.