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09-02-2021

Mental component of health-related quality of life is an independent predictor of incident functional disability among community-dwelling older people: a prospective cohort study

Tijdschrift:
Quality of Life Research
Auteurs:
Kimiko Tomioka, Midori Shima, Keigo Saeki
Belangrijke opmerkingen

Supplementary Information

The online version contains supplementary material available at https://​doi.​org/​10.​1007/​s11136-021-02780-x.

Publisher's Note

Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.

Abstract

Purpose

Previous studies have reported a positive association between poor health-related quality of life (HRQOL) and disability mainly in relation to the physical component of HRQOL. Given the mental component’s responsivity to interventions, this study aimed to investigate whether the mental component of HRQOL independently predicted functional disability.

Methods

We targeted all residents aged ≥ 65 years in one municipality and analyzed 3858 men and 4475 women without disability at baseline (November 2016). HRQOL was measured using the physical component summary (PCS) and mental component summary (MCS) of the SF-8 Health Survey. At 3-year follow-up (October 2019), incident functional disability was measured, defined as a new certification according to the Japanese long-term care insurance system. Multivariable Poisson regression models stratified by gender were used to estimate adjusted cumulative incidence ratio (CIR) and 95% confidence interval (CI) for functional disability.

Results

Among both genders, there was a significant dose-response relationship between better MCS and lower risk of functional disability, independent of potential confounders including the PCS (P for trend = 0.026 in men and 0.003 in women). Compared with the worst MCS group, the CIRs (95% CIs) for functional disability in the second worst, the middle, the second best, and the best MCS quintile groups were 1.09 (0.80–1.48), 0.58 (0.40–0.85), 0.90 (0.59–1.37), and 0.70 (0.48–1.02) for men, and 0.76 (0.58–1.00), 0.62 (0.46–0.84), 0.73 (0.53–0.99), and 0.63 (0.48–0.85) for women, respectively.

Conclusion

The MCS is an independent predictor of functional disability among high-functioning older adults. This suggests that strategies focused on mental HRQOL are important for realizing a healthy, long-lived society.

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