1·方法：用整群随机抽样方法选取成都城乡1 016例60岁及其以上老年人，进行问卷调查和体检。
Methods: 1 016 aged 60 and over in the urban and rural areas of Chengdu were randomly cluster sampled and investigated by questionnaire and medical examination.
2·建立了具有1 016个自由度的非线性振动方程，并基于固定界面模态综合法降维至34个自由度。
A nonlinear vibration equation with 1 016 degrees of freedom is formulated and the degrees of freedom are reduced to 34 based on fixed interface modal synthesis method.