{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,30]],"date-time":"2026-07-30T12:27:33Z","timestamp":1785414453233,"version":"3.56.0"},"reference-count":29,"publisher":"MDPI AG","issue":"12","license":[{"start":{"date-parts":[[2026,6,15]],"date-time":"2026-06-15T00:00:00Z","timestamp":1781481600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"the Soonchunhyang University Research Fund"},{"id":[{"id":"https:\/\/ror.org\/03qjsrb10","id-type":"ROR","asserted-by":"publisher"}]},{"name":"National Institute of Health (NIH) research","award":["2026-ER1203-00"],"award-info":[{"award-number":["2026-ER1203-00"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Nutrients"],"abstract":"<jats:p>Background\/Objectives: Body mass index (BMI) does not distinguish fat mass from lean mass. Gallagher et al. proposed percentage body fat (%BF) ranges at NIH\/WHO BMI cutoffs, but no study has derived %BF ranges for the full set of Asian-specific BMI cutoffs adopted in Korea. This study aimed to develop and externally validate prediction equations for %BF from BMI in Korean adults and to derive %BF ranges corresponding to Korean Society for the Study of Obesity (KSSO) BMI cutoffs. Methods: Sex-specific equations were developed using survey-weighted linear regression with the 1\/BMI transformation in adults aged \u2265 19 years from KNHANES 2022 (n = 4466) using InBody 970 BIA, and externally validated in KNHANES 2023 (n = 4778). Predicted %BF values were calculated at each KSSO BMI cutoff (18.5, 23.0, 25.0, 30.0, and 35.0 kg\/m2) across age-group midpoints. Results: Final equations were: Men, %BF = 51.98 \u2212 733.89 \u00d7 (1\/BMI) + 0.058 \u00d7 age (R2 = 0.544; SEE = 3.95%); Women, %BF = 64.92 \u2212 731.24 \u00d7 (1\/BMI) (R2 = 0.638; SEE = 3.66%). Age was not significant in women (p = 0.82). External validation showed mean bias of \u22120.10% and calibration slope of 1.02. The predicted %BF at the pre-obese cutoff (BMI 23.0) was 21.5\u201324.4% in men and 33.1% in women; at class I obesity (BMI 25.0), 24.1\u201327.0% and 35.7%, respectively. Conclusions: This study provides the first nationally representative %BF ranges for all five KSSO BMI cutoffs. The predicted %BF at BMI 25.0 corresponds to %BF-defined obesity in both sexes, and is consistent with the clinical relevance of the lower obesity cutoff adopted for Asian populations.<\/jats:p>","DOI":"10.3390\/nu18121935","type":"journal-article","created":{"date-parts":[[2026,6,15]],"date-time":"2026-06-15T15:00:48Z","timestamp":1781535648000},"page":"1935","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Percentage Body Fat Corresponding to Korean BMI Classification for Obesity in a Nationally Representative Population"],"prefix":"10.3390","volume":"18","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-4676-8483","authenticated-orcid":false,"given":"Yong Hee","family":"Hong","sequence":"first","affiliation":[{"name":"Department of Pediatrics, Soonchunhyang University Bucheon Hospital, Soonchunhyang University College of Medicine, Bucheon 14584, Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hyeoijin","family":"Kim","sequence":"additional","affiliation":[{"name":"Department of Physical Education, Korea National University of Education, Chungju 28173, Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7980-4014","authenticated-orcid":false,"given":"Ji-Hee","family":"Kim","sequence":"additional","affiliation":[{"name":"Department of Medical Science, Soonchunhyang University, Asan 31538, Republic of Korea"},{"name":"Institute ofMolecular Metabolism Innovation, Soonchunhyang University, Asan 31538, Republic of Korea"},{"name":"Department of Occupational Therapy, Soonchunhyang University, Asan 31538, Republic of Korea"},{"name":"Department of AI-Integrated Sports and Exercise Medicine, Soonchunhyang University, Asan 31538, Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0000-3933-0347","authenticated-orcid":false,"given":"Youngjin","family":"Jo","sequence":"additional","affiliation":[{"name":"Department of Sports Medicine, Soonchunhyang University, Asan 31538, Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yeseul","family":"Lee","sequence":"additional","affiliation":[{"name":"Department of Sports Medicine, Soonchunhyang University, Asan 31538, Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sochung","family":"Chung","sequence":"additional","affiliation":[{"name":"Department of Pediatrics, Konkuk University Medical Center, School of Medicine, Konkuk University, Seoul 05030, Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5933-2785","authenticated-orcid":false,"given":"Chul-Hyun","family":"Kim","sequence":"additional","affiliation":[{"name":"Department of AI-Integrated Sports and Exercise Medicine, Soonchunhyang University, Asan 31538, Republic of Korea"},{"name":"Department of Sports Medicine, Soonchunhyang University, Asan 31538, Republic of Korea"},{"name":"Research Institute for Basic Science, Soonchunhyang University, Asan 31538, Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2026,6,15]]},"reference":[{"key":"ref_1","unstructured":"National Institutes of Health (1998). 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