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Through assignment method, the total score of disability in multiple dimensions is obtained, and it is divided into five functional states-severe disability, partial disability, moderate disability, mild disability, and health-according to the score, and the probability of death is constructed. Using the Chinese Longitudinal Healthy Longevity Survey (CLHLS) database tracking survey data, by constructing a multistate transition probability matrix, the empirical calculation of the multistate disability transfer probability, with the help of t