Table 2

Recurrence rates of venous thrombosis in men and women

Overall venous thrombosis*
Unprovoked venous thrombosis
WomenMenWomenMen
No. of subjects 523 293 122 207 
    No. of recurrences 198 139 46 90 
    Mean age at onset of recurrence, y 40 48 49 50§ 
    Observation period, y 3896 1499 615 998 
    Annual incidence, % (95% CI) 5.1 (4.4-5.8) 9.3 (7.8-10.9) 7.5 (5.5-10.0) 9.0 (7.3-11.1) 
Relative risk (95% CI) Reference 1.7 (1.4-2.1) Reference 1.2 (0.8-1.7) 
Relative risk adjusted for     
    Antithrombin deficiency Reference 1.7 (1.3-2.1) Reference 1.2 (0.8-1.8) 
    Protein C deficiency Reference 1.7 (1.3-2.1) Reference 1.4 (0.9-2.1) 
    Protein S deficiency Reference 1.6 (1.3-2.1) Reference 1.3 (0.8-2.0) 
    FV Leiden Reference 1.7 (1.3-2.1) Reference 1.2 (0.8-1.7) 
    FVIII more than 150 IU/dL Reference 1.6 (1.3-2.0) Reference 1.2 (0.8-1.7) 
    Prothrombin 20210G>A Reference 1.6 (1.3-2.0) Reference 1.2 (0.8-1.7) 
Overall venous thrombosis*
Unprovoked venous thrombosis
WomenMenWomenMen
No. of subjects 523 293 122 207 
    No. of recurrences 198 139 46 90 
    Mean age at onset of recurrence, y 40 48 49 50§ 
    Observation period, y 3896 1499 615 998 
    Annual incidence, % (95% CI) 5.1 (4.4-5.8) 9.3 (7.8-10.9) 7.5 (5.5-10.0) 9.0 (7.3-11.1) 
Relative risk (95% CI) Reference 1.7 (1.4-2.1) Reference 1.2 (0.8-1.7) 
Relative risk adjusted for     
    Antithrombin deficiency Reference 1.7 (1.3-2.1) Reference 1.2 (0.8-1.8) 
    Protein C deficiency Reference 1.7 (1.3-2.1) Reference 1.4 (0.9-2.1) 
    Protein S deficiency Reference 1.6 (1.3-2.1) Reference 1.3 (0.8-2.0) 
    FV Leiden Reference 1.7 (1.3-2.1) Reference 1.2 (0.8-1.7) 
    FVIII more than 150 IU/dL Reference 1.6 (1.3-2.0) Reference 1.2 (0.8-1.7) 
    Prothrombin 20210G>A Reference 1.6 (1.3-2.0) Reference 1.2 (0.8-1.7) 

CI indicates confidence interval.

*

Overall indicates any first venous thrombosis and any recurrence.

Unprovoked indicates unprovoked first venous thrombosis and unprovoked recurrence.

P < .001.

§

P = .60.

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