Preventive Dentistry and Dental Public Health, School of Dentistry, Aichi Gakuin University, 1-100 Kusumoto-Cho, Chikusa-Ku, Nagoya, 464-8650, Japan.
Mie Dental Association, Tsu, Japan.
BMC Geriatr. 2024 Oct 31;24(1):900. doi: 10.1186/s12877-024-05512-1.
In 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.
In 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.
Among 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.
Although 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.
在问卷调查中，常常用自我报告的牙齿数量（SRNT）来衡量口腔健康。本研究旨在调查 SRNT 在日本老年人中的有效性。
共纳入 4984 名 75 岁和 80 岁接受牙科检查的患者。分析中使用了一份自我管理问卷，询问了牙齿数量。计算了 SRNT 与实际牙齿数量之间的一致性百分比和 Kappa 值。为了确定影响 SRNT 可靠性的因素，使用正确性作为因变量进行逻辑回归分析。
在 3950 名回答是否有≥20 颗牙齿的参与者中，客观评估的一致性为 92.9%（Kappa 值为 0.856，p<0.001）。在报告自己牙齿数量的 2621 名参与者中，SRNT 和实际牙齿数量匹配的占 57.5%（Kappa 值为 0.559；p<0.001）。实际牙齿数量和每年的牙科检查对 SRNT 的准确性有显著影响。以 SRNT 与实际牙齿数量的一致性（即牙齿数量是否超过 20）为因变量的多变量逻辑回归分析显示，实际牙齿数量、使用牙间清洁工具和每年的牙科检查与 SRNT 与实际牙齿数量的一致性显著相关。以牙齿数量一致性（±1 颗）为因变量的多变量分析显示，实际牙齿数量和使用牙间清洁工具与 SRNT 与实际牙齿数量的一致性显著相关。
尽管 SRNT 与实际牙齿数量不完全匹配，但本研究结果表明，老年人的 SRNT 在流行病学研究中是可靠和有用的。
