Body height and sex-related differences in incidence of venous thromboembolism: a Danish follow-up study.
BACKGROUND
Sex-related differences in incidence rate of venous thromboembolism (VTE) have been reported. It is unclear whether these differences reflect sex-related differences in the incidence of deep venous thrombosis (DVT), pulmonary embolism (PE) or both and to which extent the differences are mediated by known risk factors for VTE.


OBJECTIVE
To compare the incidence of DVT and PE between middle-aged men and women.


METHODS
We computed sex-specific incidences of VTE, DVT and PE and estimated the crude and adjusted incidence rate ratios (IRR) of VTE, DVT and PE using Cox regression for men versus women participating in the prospective study Diet, Cancer and Health. We controlled for body mass index, body height, leisure-time physical activity and smoking dose.


RESULTS
We verified 641 VTE events during a median follow-up time of 10 years. The overall incidence of VTE was 1.15 [95%CI: 1.07-1.25] per thousand person years; it was higher for men than women (crude IRR: 1.55 [95%CI: 1.32-1.82]). The adjusted IRR for DVT was 1.06 [95%CI: 0.75-1.50] and for PE 0.60 [95%CI: 0.41-1.18] for men versus women. The higher rate among men appeared to be mediated mainly by body height.


CONCLUSIONS
In this middle-aged population, men experienced a higher incidence of VTE due to a higher incidence of DVT. The higher incidence among men appeared to be mediated by body height. Adjusted for body height, male sex was not associated with an excess risk of either VTE or DVT but the risk of PE was notably lower compared with women.
Severinsen
Marianne Tang
MT
Department of Clinical Epidemiology, Aarhus University Hospital, Aalborg and Aarhus, Denmark. m.severinsen@rn.dk
Johnsen
Søren Paaske
SP
Tjønneland
Anne
A
Overvad
Kim
K
Dethlefsen
Claus
C
Kristensen
Søren Risom
SR
D001827:Body Height; D003718:Denmark / Q000453:epidemiology; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D015994:Incidence; D008297:Male; D008875:Middle Aged; D016016:Proportional Hazards Models; D011655:Pulmonary Embolism / Q000453:epidemiology; D012737:Sex Factors; D054556:Venous Thromboembolism / Q000453:epidemiology*; D020246:Venous Thrombosis / Q000453:epidemiology