In a study of 7,705 postmenopausal women with a mean age of 66 years and with osteoporosis or osteoporosis with an existing fracture, OPTRUMA treatment for 3 years reduced the incidence of vertebral fractures by 47% (RR 0.53, CI 0.35, 0.79; p < 0.001) and 31% (RR 0.69, CI 0.56, 0.86; p < 0.001) respectively.