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The study group (SG) comprised 50 patients with functional dysphonia, and the control group (CG) included 50 age- and gender-matched healthy individuals. All participants underwent a multidimensional voice assessment, including acoustic analysis, auditory-perceptual evaluation (GRBAS), aerodynamic measurement [Maximum Phonation Time (MPT)], and self-reported outcome measures [Voice Handicap Index-10 (VHI-10), Voice-Related Quality of Life (V-RQoL), and GFI]. Group comparisons were performed, and receiver operating characteristic (ROC) analysis was used to determine the optimal GFI cutoff based on the Youden index.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>\n                      ROC analysis demonstrated excellent diagnostic accuracy for the GFI in functional dysphonia (AUC\u2009=\u20090.983). The optimal cutoff score was \u2265\u20093, providing 96% sensitivity and 96% specificity. The SG exhibited significantly higher GFI scores [median 14 (9.75\u201319)] than the CG [0 (0\u20130)] (\n                      <jats:italic>p<\/jats:italic>\n                      \u2009&lt;\u20090.001). The SG also showed significantly deteriorated acoustic (increased shimmer, decreased harmonics-to-noise ratio), auditory-perceptual (higher G score), aerodynamic (shorter MPT), and self-reported (higher VHI-10, lower V-RQoL) parameters than the CG (all\n                      <jats:italic>p<\/jats:italic>\n                      \u2009&lt;\u20090.001).\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusion<\/jats:title>\n                    <jats:p>The GFI is a highly sensitive self-report tool for identifying functional dysphonia. A cutoff score of \u2265\u20093 provides excellent diagnostic accuracy and supports its use as a brief screening measure within multidimensional voice assessment protocols.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1007\/s00405-026-10167-2","type":"journal-article","created":{"date-parts":[[2026,3,28]],"date-time":"2026-03-28T20:10:34Z","timestamp":1774728634000},"page":"4689-4696","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Glottal function index as a brief screening tool: Determination of an optimal cutoff score for functional dysphonia"],"prefix":"10.1007","volume":"283","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-1804-9473","authenticated-orcid":false,"given":"Cigdem","family":"Onen","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6161-7501","authenticated-orcid":false,"given":"Hakan","family":"Golac","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4412-223X","authenticated-orcid":false,"given":"Guzide","family":"Atalik","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0606-1870","authenticated-orcid":false,"given":"Adnan","family":"Gulacti","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5624-267X","authenticated-orcid":false,"given":"Fatma","family":"Esen Aydinli","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3382-4220","authenticated-orcid":false,"given":"Metin","family":"Yilmaz","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2026,3,28]]},"reference":[{"key":"10167_CR1","doi-asserted-by":"publisher","first-page":"37","DOI":"10.1080\/14015430119969","volume":"26","author":"K Verdolini","year":"2001","unstructured":"Verdolini K, Ramig LO (2001) Review: occupational risks for voice problems. 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