Temporal change in the association between life satisfaction and functional decline with gender differences: an age-specific prospective cohort study
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 ana...
| Main Authors: | , , , , , , , , , , |
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| Format: | Article |
| Language: | English |
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Komiyama Printing Co. Ltd
2023-07-01
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| Series: | Environmental Health and Preventive Medicine |
| Subjects: | |
| Online Access: | https://www.jstage.jst.go.jp/article/ehpm/28/0/28_23-00019/_html/-char/en |
| _version_ | 1797771290245857280 |
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| author | Naoko Shinohara Wenjing Zhao Yifan Shan Shigekazu Ukawa Hideki Ohira Takashi Kawamura Satoe Okabayashi Kenji Wakai Masahiko Ando Kazuyo Tsushita Akiko Tamakoshi |
| author_facet | Naoko Shinohara Wenjing Zhao Yifan Shan Shigekazu Ukawa Hideki Ohira Takashi Kawamura Satoe Okabayashi Kenji Wakai Masahiko Ando Kazuyo Tsushita Akiko Tamakoshi |
| author_sort | Naoko Shinohara |
| collection | DOAJ |
| description | 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 8th, 10th, 12th, and 14th years to assess the effect of LS on functional decline across time points. Results: The impact of LS gradually weakened over time. In the 8th 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 10th year (aged 74–75), 0.72 (0.41–1.26) in the 12th year (aged 76–77), and 0.68 (0.41–1.14) in the 14th 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 8th, 10th, 12th, and 14th 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. |
| first_indexed | 2024-03-12T21:35:23Z |
| format | Article |
| id | doaj.art-4a7b33ace0e540149808eb679cf36946 |
| institution | Directory Open Access Journal |
| issn | 1342-078X 1347-4715 |
| language | English |
| last_indexed | 2024-03-12T21:35:23Z |
| publishDate | 2023-07-01 |
| publisher | Komiyama Printing Co. Ltd |
| record_format | Article |
| series | Environmental Health and Preventive Medicine |
| spelling | doaj.art-4a7b33ace0e540149808eb679cf369462023-07-27T07:49:25ZengKomiyama Printing Co. LtdEnvironmental Health and Preventive Medicine1342-078X1347-47152023-07-0128424210.1265/ehpm.23-00019ehpmTemporal change in the association between life satisfaction and functional decline with gender differences: an age-specific prospective cohort studyNaoko Shinohara0https://orcid.org/0000-0002-1572-7515Wenjing Zhao1Yifan Shan2Shigekazu Ukawa3Hideki Ohira4Takashi Kawamura5Satoe Okabayashi6Kenji Wakai7Masahiko Ando8Kazuyo Tsushita9Akiko Tamakoshi10Department of Public Health, Graduate School of Medicine, Hokkaido UniversityDepartment of Public Health, Faculty of Medicine, Hokkaido UniversityDepartment of Public Health, Graduate School of Medicine, Hokkaido UniversityGraduate School of Human Life and Ecology, Osaka Metropolitan UniversityDepartment of Psychology, Graduate School of Informatics, Nagoya UniversityKyoto University Health Service, Kyoto UniversityKyoto University Health Service, Kyoto UniversityDepartment of Preventive Medicine, Nagoya University Graduate School of MedicineCenter for Advanced Medicine and Clinical Research, Nagoya University HospitalComprehensive Health Science Center, Aichi Health Promotion Public Interest FoundationDepartment of Public Health, Faculty of Medicine, Hokkaido UniversityBackground: 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 8th, 10th, 12th, and 14th years to assess the effect of LS on functional decline across time points. Results: The impact of LS gradually weakened over time. In the 8th 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 10th year (aged 74–75), 0.72 (0.41–1.26) in the 12th year (aged 76–77), and 0.68 (0.41–1.14) in the 14th 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 8th, 10th, 12th, and 14th 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.https://www.jstage.jst.go.jp/article/ehpm/28/0/28_23-00019/_html/-char/enagedlife satisfactionwell-beingfunctional declinemortalityjapan |
| spellingShingle | Naoko Shinohara Wenjing Zhao Yifan Shan Shigekazu Ukawa Hideki Ohira Takashi Kawamura Satoe Okabayashi Kenji Wakai Masahiko Ando Kazuyo Tsushita Akiko Tamakoshi 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 aged life satisfaction well-being functional decline mortality japan |
| title | Temporal change in the association between life satisfaction and functional decline with gender differences: an age-specific prospective cohort study |
| title_full | Temporal change in the association between life satisfaction and functional decline with gender differences: an age-specific prospective cohort study |
| title_fullStr | Temporal change in the association between life satisfaction and functional decline with gender differences: an age-specific prospective cohort study |
| title_full_unstemmed | Temporal change in the association between life satisfaction and functional decline with gender differences: an age-specific prospective cohort study |
| title_short | Temporal change in the association between life satisfaction and functional decline with gender differences: an age-specific prospective cohort study |
| title_sort | temporal change in the association between life satisfaction and functional decline with gender differences an age specific prospective cohort study |
| topic | aged life satisfaction well-being functional decline mortality japan |
| url | https://www.jstage.jst.go.jp/article/ehpm/28/0/28_23-00019/_html/-char/en |
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