Epidemiology The population of older men and women has been increasing, and therefore the number of people with osteoporosis is increasing + In the USA, about 21%of postmenopausal women have osteoporosis (low bone density), and about 16% have had a fracture. n women older than 80. about 40% have experienced a fracture of the hip, vertebra, arm, or pelvis. Women have more osteoporotic fractures than men Age is one of the most important risks in all groups w The decreased physical activity may be playing a role in increased hip fracturesEpidemiology  The population of older men and women has been increasing, and therefore the number of people with osteoporosis is increasing.  In the USA, about 21% of postmenopausal women have osteoporosis (low bone density), and about 16% have had a fracture. In women older than 80, about 40% have experienced a fracture of the hip, vertebra, arm, or pelvis.  Women have more osteoporotic fractures than men. Age is one of the most important risks in all groups.  The decreased physical activity may be playing a role in increased hip fractures