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Their mean age was 69.6 years. Background data were obtained from the medical records, and oral function measurements were performed the day before discharge. Final analysis was performed using the receiver operating characteristic (ROC) curve and propensity score. The primary tumor site was the tongue in 45 (44.1%), gingiva in 41 (40.2%), and other sites in 16 (15.7%) patients. ROC analysis showed a cutoff age of 75 years for occlusal force. The propensity score method showed that the odds ratio of age was 4.32 (confidence interval: 1.48\u2009\u2212\u200912.55 [<jats:italic>P<\/jats:italic>\u2009=\u20090.01]) for occlusal force. Treatment age is independently associated with postoperative oral function, and the incidence of postoperative oral dysfunction is approximately four times higher for patients aged\u2009&gt;\u200975 years. The development of measures for postoperative oral function recovery may be particularly necessary in older adult patients aged\u2009&gt;\u200975 years.<\/jats:p>","DOI":"10.1038\/s41598-025-91017-9","type":"journal-article","created":{"date-parts":[[2025,3,21]],"date-time":"2025-03-21T08:52:18Z","timestamp":1742547138000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Effects of age on postoperative oral function in older adults with oral squamous cell carcinoma and its cutoff values: a cross-sectional study"],"prefix":"10.1038","volume":"15","author":[{"given":"Tatsuhito","family":"Kotani","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yuhei","family":"Matsuda","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mayu","family":"Takeda","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Reon","family":"Morioka","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yukiho","family":"Shimamura","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Rie","family":"Osako-Sonoyama","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hiroto","family":"Tatsumi","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Masako","family":"Fujioka-Kobayashi","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Takahiro","family":"Kanno","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2025,3,21]]},"reference":[{"key":"91017_CR1","doi-asserted-by":"publisher","first-page":"105694","DOI":"10.1016\/j.oraloncology.2021.105694","volume":"125","author":"O Cohen","year":"2022","unstructured":"Cohen, O. et al. 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