4 In a long-term randomised (4 to 6 year) monotherapy study in recently diagnosed patients with type 2 diabetes mellitus, an increased incidence of bone fractures was noted after the first year of treatment in female patients taking rosiglitazone (9.3%, 2.7 patients per 100 patient years) vs metformin (5.1%, 1.5 patients per 100 patient years) or glyburide/ glibenclamide (3.5%, 1.3 patients per 100 patient years).