ArticleBMC geriatrics2024
Validity of the self-reported number of teeth in independent older people in Japan.
Article in BMC geriatrics, 2024. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 3 papers.
What it found
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The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
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Who cites it
3 citing papers in PubMed.
- Oral Health and Social Isolation After 6 Years: Mediation of Oral Functions.Community dentistry and oral epidemiology · 2026Article
- The Effect of Tooth Loss on Depression and Anxiety Among Older Adults in China: The Mediating Role of Dietary Diversity.Nutrients · 2026Article
- A novel nutritional index and risk of edentulism: evidence from cross-sectional, prospective, and trajectory analyses.Lipids in health and disease · 2026Article
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Authors and funding
4 authors.
Funding
Abstract
backgroundIn questionnaire surveys, questions about self-reported number of teeth (SRNT) are often used as a measure oral health. This study investigated the validity of SRNT in older Japanese people.
methodsIn total, 4984 75- and 80-year-old patients who underwent dental examinations were enrolled. A self-administered questionnaire that asked about the number of teeth was used in the analysis. The percentage agreement and kappa value were calculated for the agreement between SRNT and observed numbers of teeth. To identify factors that affect the reliability of SRNT, a logistic regression analysis was performed using correctness of SRNT as the dependent variable.
resultsAmong the 3950 participants who responded as to whether they had ≥ 20 teeth, the degree of agreement was 92.9% (kappa value 0.856, p < 0.001) in an objective evaluation. Of the 2621 participants who reported their numbers of teeth, the SRNT and observed number of teeth matched in 57.5% (kappa value 0.559; p < 0.001). Observed number of teeth and annual dental checkup had a significant effect on the accuracy of SRNT. Multivariate logistic regression analysis, with the agreement between SRNT and the observed number of teeth (i.e. whether the number of teeth exceeded 20) as the dependent variable, showed that the observed number of teeth, use of interdental cleaning tools, and annual dental checkup were significantly associated with the agreement between SRNT and the actual number of teeth. In multivariate analysis with tooth number agreement (± 1 tooth) as the dependent variable, the observed number of teeth and use of interdental cleaning tools were significantly associated with the agreement between SRNT and the observed number of teeth.
conclusionAlthough SRNT did not perfectly match the observed numbers of teeth, the results of this study imply that the SRNT of older people is reliable and useful in epidemiological studies.
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