Number of Teeth and Incidence of Hip Fracture in Older Adults Aged ≥75 Years: The OHSAKA Study
Background: Several studies reported an association between the number of teeth and the incidence of hip fractures in observational studies, mainly in middle-aged adults. This retrospective cohort study aimed to clarify the association between the number of teeth and the incidence of hip fractures....
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| Language: | English |
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Japan Epidemiological Association
2025-07-01
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| Series: | Journal of Epidemiology |
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| Online Access: | https://www.jstage.jst.go.jp/article/jea/35/7/35_JE20240165/_pdf |
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| author | Naoko Otsuki Tomoaki Mameno Yuya Kanie Masahiro Wada Maki Shinzawa Kazunori Ikebe Ryohei Yamamoto |
| author_facet | Naoko Otsuki Tomoaki Mameno Yuya Kanie Masahiro Wada Maki Shinzawa Kazunori Ikebe Ryohei Yamamoto |
| author_sort | Naoko Otsuki |
| collection | DOAJ |
| description | Background: Several studies reported an association between the number of teeth and the incidence of hip fractures in observational studies, mainly in middle-aged adults. This retrospective cohort study aimed to clarify the association between the number of teeth and the incidence of hip fractures. Methods: In this retrospective cohort study, a total of 256,772 participants aged 75 years or older who underwent public dental checkups in Japan were evaluated. Exposure in this study was the number of teeth, with a maximum number of 28, excluding third molars. Outcome measures were the incidence of hip fractures needing surgery, using the Japanese procedure codes in medical claims. Results: A total of 190,998 participants met the inclusion criteria and were available for analysis. Adjusted Fine and Gray models identified a significant association between the number of teeth, including sound, filled, and decayed teeth, and the incidence of hip fractures among women but not for men. The continuous net reclassification improvement of the sound and filled teeth count model increased by 0.078 compared with that of the sound, filled, and decayed teeth count model among women. Conclusion: The number of sound and filled teeth predicted the risk of hip fractures in women, whereas no association was observed between the number of teeth and hip fractures in men. |
| format | Article |
| id | doaj-art-d70e35ae757549b2b801f7cff737955f |
| institution | DOAJ |
| issn | 0917-5040 1349-9092 |
| language | English |
| publishDate | 2025-07-01 |
| publisher | Japan Epidemiological Association |
| record_format | Article |
| series | Journal of Epidemiology |
| spelling | doaj-art-d70e35ae757549b2b801f7cff737955f2025-08-20T03:15:19ZengJapan Epidemiological AssociationJournal of Epidemiology0917-50401349-90922025-07-0135731332010.2188/jea.JE20240165Number of Teeth and Incidence of Hip Fracture in Older Adults Aged ≥75 Years: The OHSAKA StudyNaoko Otsuki0Tomoaki Mameno1Yuya Kanie2Masahiro Wada3Maki Shinzawa4Kazunori Ikebe5Ryohei Yamamoto6Health and Counseling Center, Osaka University, Osaka, JapanDepartment of Removable Prosthodontics and Gerodontology, Osaka University Graduate School of Dentistry, Osaka, JapanHealth and Counseling Center, Osaka University, Osaka, JapanDepartment of Removable Prosthodontics and Gerodontology, Osaka University Graduate School of Dentistry, Osaka, JapanHealth and Counseling Center, Osaka University, Osaka, JapanDepartment of Removable Prosthodontics and Gerodontology, Osaka University Graduate School of Dentistry, Osaka, JapanHealth and Counseling Center, Osaka University, Osaka, JapanBackground: Several studies reported an association between the number of teeth and the incidence of hip fractures in observational studies, mainly in middle-aged adults. This retrospective cohort study aimed to clarify the association between the number of teeth and the incidence of hip fractures. Methods: In this retrospective cohort study, a total of 256,772 participants aged 75 years or older who underwent public dental checkups in Japan were evaluated. Exposure in this study was the number of teeth, with a maximum number of 28, excluding third molars. Outcome measures were the incidence of hip fractures needing surgery, using the Japanese procedure codes in medical claims. Results: A total of 190,998 participants met the inclusion criteria and were available for analysis. Adjusted Fine and Gray models identified a significant association between the number of teeth, including sound, filled, and decayed teeth, and the incidence of hip fractures among women but not for men. The continuous net reclassification improvement of the sound and filled teeth count model increased by 0.078 compared with that of the sound, filled, and decayed teeth count model among women. Conclusion: The number of sound and filled teeth predicted the risk of hip fractures in women, whereas no association was observed between the number of teeth and hip fractures in men.https://www.jstage.jst.go.jp/article/jea/35/7/35_JE20240165/_pdfhip fracturespublic dental check-upstooth lossolder adultslongitudinal study |
| spellingShingle | Naoko Otsuki Tomoaki Mameno Yuya Kanie Masahiro Wada Maki Shinzawa Kazunori Ikebe Ryohei Yamamoto Number of Teeth and Incidence of Hip Fracture in Older Adults Aged ≥75 Years: The OHSAKA Study Journal of Epidemiology hip fractures public dental check-ups tooth loss older adults longitudinal study |
| title | Number of Teeth and Incidence of Hip Fracture in Older Adults Aged ≥75 Years: The OHSAKA Study |
| title_full | Number of Teeth and Incidence of Hip Fracture in Older Adults Aged ≥75 Years: The OHSAKA Study |
| title_fullStr | Number of Teeth and Incidence of Hip Fracture in Older Adults Aged ≥75 Years: The OHSAKA Study |
| title_full_unstemmed | Number of Teeth and Incidence of Hip Fracture in Older Adults Aged ≥75 Years: The OHSAKA Study |
| title_short | Number of Teeth and Incidence of Hip Fracture in Older Adults Aged ≥75 Years: The OHSAKA Study |
| title_sort | number of teeth and incidence of hip fracture in older adults aged ≥75 years the ohsaka study |
| topic | hip fractures public dental check-ups tooth loss older adults longitudinal study |
| url | https://www.jstage.jst.go.jp/article/jea/35/7/35_JE20240165/_pdf |
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