[Similarities and differences between self-rated and proxy-rated health in extreme old age].

Especially in old age, the global well-being of persons is strongly influenced by their health situation. Due to functional limitations, research on the development of persons in extreme old age often uses proxy ratings of health instead of self-ratings common in younger age groups. However, it is not known whether self- and proxy-ratings provide comparable information about the health status of extremely old persons. The current study with 53 centenarians and 53 proxies examines similarities and differences between self and proxy-ratings of health. The results indicate a high degree of similarity in some health ratings, an overestimation of ADL capacities by the centenarians, and that self-ratings to a large degree reflect the current mood levels of individuals. Findings are discussed with respect to the differences in the kind of information used for general health ratings.