The Office of Research on Women's Health provided supplemental funds to measure hemostatic factors, including fibrinogen, factor VIIc and antigen, antithrombin III and PAI-1 in plasma samples for all subjects at baseline. The supplement allowed a longitudinal description of changes in hemostatic factors that appeared to occur during the perimenopausal transition and an investigation of whether diet and diet intervention altered the pattern of hemostatic changes observed at menopause.