Cohort-specific and pooled effect (measured in terms of hazard ratios) of mortality among women diagnosed with breast cancer after the age of 50 years (a) by categories of average body mass index (BMI); (b) by categories of cumulative time spent with overweight (body mass index, BMI ≥ 25 kg/m2) during early and mid-adulthood. The model was adjusted for smoking status, alcohol consumption, vigorous physical activity, education, and history of diabetes at study entry, and stratified on cancer stage at diagnosis, age at diagnosis, and country (for the EPIC study only).