Methods 75 healthy postmenopausal women were divided into three groups, 20 with normal bone density (Group A), 20 with osteopenia (Group B) and 35 with osteoporosis (Group C), according to broadband ultrasound attenuation (BUA).

• 方法 75 例正常绝经后妇女按照宽波段超声衰减（BUA） 分成骨量正常组（A 组） 、骨量减少组（B组） 、骨质疏松组（C组）。