OBJECTIVE: In places where sun exposure during the winter is limited, bone mineral density (BMD) may present seasonal variations, increasing during the summer and decreasing during the winter period. There have been suggestions that this variation could influence prospective evaluations of BMD studies. The aim of this study was to evaluate if the seasons of the year (summer/winter) are associated to variations in BMD values. METHODS: Clinic based cross-sectional study, conducted in the state of Rio Grande do Sul (RS). […]