2 Oe N, Tadaka E. Differences in loneliness and social isolation among community-dwelling older adults by household type: a nationwide survey in Japan. Healthcare (Basel) 2023; 11: 1647. https://doi.org/10. 3390/healthcare11111647. 3 Iwasa H, Yoshida Y. Personality and health literacy among communitydwelling older adults living in Japan.