Cognitive and physical function of people older than 80 years in China from 1998 to 2014.

Objectives This study was performed to describe the health status of Chinese oldest-old individuals aged ≥80 years from 1998 to 2014 and explore differences in their health status based on demographic characteristics and socioeconomic status. Methods Data were obtained from the seven waves of the Chinese Longitudinal Healthy Longevity Survey. The Mini Mental State Examination, Katz Index of Independence in Activities of Daily Living, and chair stand test were used to examine cognitive and physical function. Logistic regression was used to evaluate the changes in health outcomes. Results Regression results showed increasing cognitive impairment trends and decreasing disability trends, indicating that the oldest-old individuals had worse body function in more recent years. Older people and women had a weaker health status. Rural elders had better physical performance but worse cognitive function. Participants with an education had better overall functioning. Individuals with severe disability had the shortest survival time among the study population. Conclusions From 1998 to 2014, the health status of oldest-old individuals was relatively stable in China. These findings indicate the need for specific and continuing attention to the oldest-old population to improve their health condition.