Objective To understand the distribution of prevalence rate of osteopenia (OPA) in the middle - aged and elderly in some areas of China.

• 目的了解中国中老年人群骨量减少症(OPA)患病率分布情况。方法采用分层多阶段整群抽样方法对中国五大行政区5600例40岁以上男女人群进行骨密度测量和问卷调查。