Mortality- and Health-Related Factors in a Community-Dwelling of Oldest-Older Adults at the Age of 90: A 10-Year Follow-Up Study

Yoshiaki Nomura, Mieko Shimada, Erika Kakuta, Ayako Okada, Ryoko Otsuka, Yasuko Tomizawa, Chieko Taguchi, Kazumune Arikawa, Hideki Daikoku, Tamotsu Sato and Nobuhiro Hanada
Additional contact information
Yoshiaki Nomura: Department of Translational Research, School of Dental Medicine, Tsurumi University, Yokohama 230-8501, Japan
Mieko Shimada: Department of Dental Hygiene, Chiba Prefectural University of Health Sciences, Chiba 261-0014, Japan
Erika Kakuta: Department of Oral Bacteriology, School of Dental Medicine, Tsurumi University, Yokohama 230-8501, Japan
Ayako Okada: Department of Translational Research, School of Dental Medicine, Tsurumi University, Yokohama 230-8501, Japan
Ryoko Otsuka: Department of Translational Research, School of Dental Medicine, Tsurumi University, Yokohama 230-8501, Japan
Yasuko Tomizawa: Department of Cardiovascular Surgery, Tokyo Women’s Medical University, Tokyo 162-8666, Japan
Chieko Taguchi: Department of Preventive and Public Oral Health, School of Dentistry at Matsudo, Nihon University, Matsudo 470-2101, Japan
Kazumune Arikawa: Department of Preventive and Public Oral Health, School of Dentistry at Matsudo, Nihon University, Matsudo 470-2101, Japan
Hideki Daikoku: Iwate Dental Association, Morioka 020-0045, Japan
Tamotsu Sato: Iwate Dental Association, Morioka 020-0045, Japan
Nobuhiro Hanada: Department of Translational Research, School of Dental Medicine, Tsurumi University, Yokohama 230-8501, Japan

IJERPH, 2020, vol. 17, issue 24, 1-17

Abstract: Mortality is obviously intended for epidemiological studies of community-dwelling older adults. There are several health-related factors associated with nutritional status and mortality. The aim of this study was to elucidate the risk factor for mortality in community-dwelling oldest-older adults at the age of 90 and clarify the structure of health-related factors associated with mortality. A 10-year follow-up study was performed for 93 subjects at the age of 90. The mean and median of their survival days were 2373 and 2581 days for women, and 1694 and 1793 days for men. By Cox’s proportional hazards model, health-related factors associated with mortality were self-assessed for chewing ability, activities of daily living (ADLs), serum albumin, total cholesterol, serum creatinine, and gripping power for women but not for men. These factors interacted with each other, and the association of these factors was different in women and men. Self-assessed chewing ability was a powerful risk factor for mortality in women at the age of 90. It acted independently from nutritional status. For older adults, addressing healthy food choices together with improved oral functions is useful. However, risk factors for mortality may depend on the life stage of subjects. To investigate the risk factor for the mortality, the life course approach is necessary.

Keywords: mortality; self-assessed chewing ability; serum albumin; ADL; physical performance (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2020
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