Changes in body weight and incidence of hip fracture among middle aged Norwegians

Abstract

We followed up 21 510 women and 21 157 men born between 1925 and 1940 attending both the first (1974-8) and the similar second (1977-83) cardiovascular screening in three Norwegian counties (85.2% of all invited)2 on average 11.3 (range 0.01-13.8) years after the second screening to study the incidence of hip fracture. We identified hip fractures (cervical or trochanteric) as described elsewhere1 at all hospitals in the three counties. We calculated the observation time for each person from the second screening to hip fracture, emigration, death, or end of follow up (in that order). We matched the file to the cancer registry of Norway, which has information on all diagnosed cancers in Norway, and to the register of death and emigration form “Statistics Norway.” Adjustment was made for potential confounders as described in a previous study of this cohort.1