Are there education differentials in disability and mortality transitions and active life expectancy among Japanese older adults? Findings from a 10-year prospective cohort study

Abstract

Objectives. To investigate the robust education-health association found in Western developed nations in the Japanese context. We examined disability and mortality transitions and computed active life expectancy (ALE) by educational attainment for a cohort of Japanese adults aged 65+ years. Method. Nationally representative data from the Nihon University Japanese Longitudinal Study of Aging over a 10-year period in Japan (1999, 2001, 2003, 2006, and 2009) were used (N = 4,968). Disability was measured by difficulties in performing daily activities. A multistate life table method was employed using an interpolated Markov chain approach. Results. There is little effect of education on disability and mortality transitions. Except for transiting from an active to inactive state (disability incidence), the other health transitions, including to mortality, are not statistically significant. ALE computations show that Japanese men and women with more education can expect more years of remaining life and active life. Discussion. The robust education-health relationship found in Western societies does not seem applicable in Japan. We discuss the casual mechanisms addressed in the literature in relation to Japan's relatively egalitarian society and specific characteristics. © The Author 2011.