2011-2018CLHLS

The data for this study come from the the Chinese Longitudinal Healthy Longevity Survey (CLHLS), the largest cohort study of the elderly population in China, organised by the Centre for Healthy Ageing and Development at Peking University and the National Institute for Development Research. The CLHLS covered 23 provinces, municipalities, and autonomous regions, with a cumulative total of 113,000 household interviews, and randomly selected about half of the cities and counties as research sites in the 22 research provinces (excluding Hainan Province). The survey was approved by the Institutional Review Board of Peking University(IRB00001052-13074). All participants or their legal representatives provided written informed consent.