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Tooth Loss and Decline in Functional Capacity: A Prospective Cohort Study from the Japan Gerontological Evaluation Study

Sato, Y; Aida, J; Kondo, K; Tsuboya, T; Watt, RG; Yamamoto, T; Koyama, S; ... Osaka, K; + view all (2016) Tooth Loss and Decline in Functional Capacity: A Prospective Cohort Study from the Japan Gerontological Evaluation Study. Journal of the American Geriatrics Society , 64 (11) pp. 2336-2342. 10.1111/jgs.14324. Green open access

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Abstract

OBJECTIVES: To describe associations between tooth loss and changes in higher-level functional capacity. DESIGN: Prospective cohort study. SETTING: Twenty-four Japanese municipalities between 2010 and 2013. PARTICIPANTS: Functionally independent community-dwelling persons aged 65 and older (N = 62,333). MEASUREMENTS: Self-reported number of teeth was used as an exposure variable. The outcome was changes in higher-level functional capacity measured using the Tokyo Metropolitan Institute of Gerontology Index of Competence (TMIG-IC), which consists of three domains: instrumental activities of daily living, intellectual activity, and social roles. The TMIG-IC score ranges from 0 (lowest function) to 13 (highest function). All covariates were chosen from baseline demographic, socioeconomic, health behavior, and health variables based upon evidence from previous studies. Inverse-probability weighting (IPW) with propensity score and multiple linear regression, estimating nonstandardized coefficients (β) and 95% confidence intervals (CIs), were used. RESULTS: The baseline response rate was 65.2%, and the follow-up rate was 70.1%. During the follow-up period, participants' TMIG-IC score declined by an average of 0.247 points (standard deviation: 1.446). The results showed a significant dose-response association between tooth loss and decline in higher-level functional capacity in multiple linear regression models. IPW models estimated the increment in TMIG-IC score (β = 0.170, 95% CI = 0.114-0.227) if edentulous participants gained 20 or more natural teeth. CONCLUSION: Tooth loss is associated with future decline in higher-level functional capacity. IPW models suggest that treatment for tooth loss attenuates decline in higher-level functional capacity.

Type: Article
Title: Tooth Loss and Decline in Functional Capacity: A Prospective Cohort Study from the Japan Gerontological Evaluation Study
Open access status: An open access version is available from UCL Discovery
DOI: 10.1111/jgs.14324
Publisher version: http://doi.org/10.1111/jgs.14324
Language: English
Additional information: © 2016, Copyright the Authors Journal compilation © 2016, The American Geriatrics Society. This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Independent living, oral health, propensity score, tooth loss
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Population Health Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Population Health Sciences > Institute of Epidemiology and Health
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Population Health Sciences > Institute of Epidemiology and Health > Epidemiology and Public Health
URI: https://discovery.ucl.ac.uk/id/eprint/1518689
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