Disability trajectories in activities of daily living of elderly Chinese before death

This study aims to analyze the changes in activities of daily living(ADL)of the Chinese elderly before death,and to explore the heterogeneity in this process.Using data from the Chinese Longitudinal Healthy Longevity Survey(CLHLS),we quantify disability trajectories of ADL using a group-based trajectory model and find that there are three types of disability trajectory for ADL.The elderly who differ by socioeconomic status,childhood experiences,health behaviors,ages and birth cohorts show significant differences in their disability trajectories.Long duration of disability is found to be more prevalent in older females and people with high socioeconomic status.Good and stable status of ADL is more common among males and people of low socioeconomic status,while the elderly in an early cohort who died at older ages were more likely to have experienced a long duration of disability.Selective and protective effects contribute to the observed differences in trajectories.