皆川 友香

Abstract This study tests the “longevity hypothesis,” which posits that women’s greater number of years spent in poor health is primarily a direct consequence of their longer survival. We analyse gender differences in unhealthy life years (ULY) at age 50 across 22 European countries in 2015–2017. ULY was estimated using three approaches—the Sullivan method, the cross-sectional average length of healthy life, and multistate life tables—applied to four health indicators of varying severity: chronic diseases, functional limitations, self-rated health, and disability. Data were drawn from the Human Mortality Database and the Survey of Health, Ageing and Retirement in Europe. We decomposed the gender gap in ULY into a “mortality effect” (ME), reflecting differences in life years lived, and a “health effect” (HE), reflecting differences in morbidity prevalence. Women at age 50 lived more unhealthy years than men across almost all health indicators and countries. In most cases, more than half of the gender gap in ULY was attributable to the ME, indicating that women’s longer survival primarily explains their greater number of years spent in poor health. The HE showed greater variation across indicators and countries. Results were most consistent for chronic diseases and self-rated health, while functional limitations and disability yielded smaller and less consistent differences. Findings support the longevity hypothesis: women’s higher life expectancy is the main driver of their longer lifetime spent in poor health. The variation across health dimensions highlights the importance of distinguishing between them when studying gender inequalities in health.

ABSTRACT Extensive literature exists on the physical health of the Japanese population whereas relatively little is known about their mental health. Moreover, most studies have assessed physical and mental health separately, and this further confounds the relationship between the two. Using the concept of health expectancy, this study investigated the trends in the relationship between physical and mental health among Japanese men and women aged 20 years or more between 2010 and 2022. Psychological distress, based on the Comprehensive Survey of Living Conditions, was used as an indicator of mental health. We employed Sullivan's method to estimate the length of life with or without distress of varying degrees. Our results showed substantial improvements in distress‐free life expectancy for both genders during the study period. Younger people have gained more distress‐free years than their older counterparts, placing older individuals, especially men, at an increased risk of psychological distress. These findings contribute to the literature on longevity in Japan by quantifying the role of mental health in the population's overall health. Given the recent increase in mental health problems, greater policy emphasis on the relationship between physical and mental health status is required.

Abstract Background The European Union has used Healthy Life Years (HLY) as an indicator to monitor the health of its aging populations. Scholarly and popular interest in HLY across countries has grown, particularly regarding the ranking of countries. It is important to note that HLY is based on self-assessments of activity limitations, raising the possibility that it might be influenced by differences in health reporting behaviours between populations, a phenomenon known as differential item functioning (DIF). Methods We estimated DIF-adjusted HLY at age 50 for Belgium, France, Germany, Greece, Italy, the Netherlands, Spain, and Sweden to determine the extent to which differences in HLY might be influenced by reporting heterogeneity across countries. We used anchoring vignettes, taken from the 2004 Survey of Health, Ageing and Retirement in Europe, to estimate DIF-adjusted prevalence rates of activity limitations measured by the Global Activity Limitations Indicator (GALI). The Sullivan method was used to calculate DIF-adjusted HLY. Results Changes in HLY before and after adjustment ranged from a 1.20-year decrease for men in Italy to a 1.61-year increase for women in Spain. Adjustment for DIF produced changes in the rankings of the countries by HLY, with upward and downward movements of up to three positions. Conclusion Our results show that DIF is likely to affect HLY estimates, thereby posing a challenge to the validity of comparisons of HLY across European countries. The findings suggest that HLY should be used to monitor population health status within a country, rather than to make comparisons across countries.