Temporal change in the association between life satisfaction and functional decline with gender differences: an age-specific prospective cohort study

Shinohara，Naoko1; Zhao，Wenjing2,3; Shan，Yifan1,4; Ukawa，Shigekazu5; Ohira，Hideki6; Kawamura，Takashi7; Okabayashi，Satoe7; Wakai，Kenji8; Ando，Masahiko9; Tsushita，Kazuyo10,11; Tamakoshi，Akiko2

2023

10.1265/ehpm.23-00019

Environmental Health and Preventive Medicine   Impact Factor & Quartile

1342-078X

1347-4715

Background: Although life satisfaction (LS) has been shown to predict mortality, research studying the relationship between LS and functional decline is scarce. This study examined the association between LS and functional decline across four time points in young-old Japanese adults. Methods: We analysed 1,899 community-dwelling 65-year-olds in this age-specific cohort study conducted between 2000 and 2005. The Life Satisfaction Index K was used to evaluate LS and was classified into quartiles. Functional decline was determined using the Japanese Long-Term Care Insurance (LTCI) system: 1) mild disability; 2) severe disability; 3) all-cause mortality; 4) mild or severe disability; 5) severe disability or death; 6) mild or severe disability, or death. Adjusted hazard ratios (HR) with 95% confidence intervals (CI) were calculated using the Cox proportional hazard model. The analyses were conducted in the 8,10,12, and 14 years to assess the effect of LS on functional decline across time points. Results: The impact of LS gradually weakened over time. In the 8 year (aged 72–73), a higher LS was associated with a lower risk of mild or severe disability among the women participants (adjusted HR [95% CI] = 0.30 [0.11–0.81]). However, the effect disappeared gradually (adjusted HR [95% CI] = 0.55 [0.27–1.14]) in the 10 year (aged 74–75), 0.72 (0.41–1.26) in the 12 year (aged 76–77), and 0.68 (0.41–1.14) in the 14 year (aged 78–79). This trend continued in severe disability or death (adjusted HR [95% CI] = 0.24 [0.06–0.70], 0.31 [0.11–0.76], 0.57 [0.28–1.14], and 0.60 [0.32–1.12]) and mild or severe disability, or death (adjusted HR [95% CI] = 0.30 [0.14–0.68], 0.46 [0.24–0.87], 0.67 [0.41–1.10], and 0.65 [0.42–1.02]) in the 8,10,12, and 14 years, respectively. No statistically significant association was found among men at any time points or in any classification of outcomes. Conclusions: Higher LS scores in 65-year-old women were associated with a lower risk for functional decline in any combination of mild disability, severe disability, or death. Additionally, the effect of LS was observed to weaken over time. Trial registration: This is not an intervention survey and does not require registration.

Aged Functional decline Japan Life satisfaction Mortality Well-being

SCI ; SSCI

English

Others

Ministry of Education, Culture, Sports, Science and Technology[JP15390197];Ministry of Education, Culture, Sports, Science and Technology[JP20K02392];Ministry of Education, Culture, Sports, Science and Technology[JP25893003];Ministry of Education, Culture, Sports, Science and Technology[JP26460760];Ministry of Education, Culture, Sports, Science and Technology[JP26520105];

Public, Environmental & Occupational Health

Public, Environmental & Occupational Health

WOS:001031426700007

JAPANESE SOC HYGIENE

2-s2.0-85163999473

Scopus

1.Department of Public Health,Graduate School of Medicine,Hokkaido University,Sapporo,Japan
2.Department of Public Health,Faculty of Medicine,Hokkaido University,Sapporo,Japan
3.School of Public Health and Emergency Management,Southern University of Science and Technology,Guangdong,China
4.The First Affiliated Hospital of Zhengzhou University,Zhengzhou,China
5.Graduate School of Human Life and Ecology,Osaka Metropolitan University,Osaka,Japan
6.Department of Psychology,Graduate School of Informatics,Nagoya University,Nagoya,Japan
7.Kyoto University Health Service,Kyoto University,Kyoto,Japan
8.Department of Preventive Medicine,Nagoya University Graduate School of Medicine,Nagoya,Japan
9.Center for Advanced Medicine and Clinical Research,Nagoya University Hospital,Nagoya,Japan
10.Comprehensive Health Science Center,Aichi Health Promotion Public Interest Foundation,Chita,Japan
11.Faculty of Nutrition,Kagawa Nutrition University,Sakado,Japan

Shinohara，Naoko,Zhao，Wenjing,Shan，Yifan,et al. Temporal change in the association between life satisfaction and functional decline with gender differences: an age-specific prospective cohort study[J]. Environmental Health and Preventive Medicine,2023,28.

Shinohara，Naoko.,Zhao，Wenjing.,Shan，Yifan.,Ukawa，Shigekazu.,Ohira，Hideki.,...&Tamakoshi，Akiko.(2023).Temporal change in the association between life satisfaction and functional decline with gender differences: an age-specific prospective cohort study.Environmental Health and Preventive Medicine,28.

Shinohara，Naoko,et al."Temporal change in the association between life satisfaction and functional decline with gender differences: an age-specific prospective cohort study".Environmental Health and Preventive Medicine 28(2023).