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To achieve this, we aim to develop a predictive equation based on anthropometric values, with optimal diagnostic utility. This is a cross-sectional observational study, involving schoolgoers aged 11\u201317\u00a0years in the Vigo metropolitan area. Out of 10,747 individuals, 577 were randomly recruited. Variables: age, sex, ethnicity\/country of origin, weight, height, 8 skinfolds, 3 diameters, 7 perimeters, and 85% percentile of body fat mass as the gold standard. Generalized additive regression was selected by cross-validation and compared using receiver operating characteristic curves (ROC curves). Sensitivity, specificity, positive and negative predictive values, true positive and true negative values, false positive and false negative values, accuracy, and positive and negative likelihood ratios were calculated. Two models were identified. The optimal model includes sex, weight, height, leg perimeter, and arm perimeter, with sensitivity of 0.93 (0.83\u20131.00), specificity of 0.91 (0.83\u20130.96), accuracy of 0.91 (0.84\u20130.96), and area under the curve (AUC) of 0.957 (0.928\u20130.986). The second model includes sex, age, and body mass index, with sensitivity of 0.93 (0.81\u20131.00), specificity of 0.90 (0.80\u20130.97), accuracy of 0.90 (0.82\u20130.96), and an AUC of 0.944 (0.903\u20130.984).<\/jats:p>\n                <jats:p><jats:italic>Conclusion<\/jats:italic>: Two predictive models, with the 85th percentile of fat mass as the gold standard, built with basic anthropometric measures, show very high diagnostic utility parameters. Their calculation is facilitated by a complementary online calculator.\n<jats:table-wrap><jats:table><jats:tbody>\n                      <jats:tr>\n                        <jats:td colspan=\"2\"><jats:bold>What is Known:<\/jats:bold><jats:italic>\u2022 In routine clinical practice, mainly in primary care, BMI is used to determine overweight and obesity. This index has its weaknesses in the assessment of children.<\/jats:italic><\/jats:td>\n                      <\/jats:tr>\n                      <jats:tr>\n                        <jats:td colspan=\"2\"><jats:bold>What is New:<\/jats:bold><jats:italic>\u2022\u00a0<\/jats:italic><jats:italic>We provide a calculator whose validated algorithm, through the determination of fat mass by impedanciometry, makes it possible to determine the risk of overweight and obesity in the community setting, through anthropometric measurements, providing a new practical, accessible and reliable model that improves the classification of overweight and obesity in children with respect to that obtained by determining BMI.<\/jats:italic><\/jats:td>\n                      <\/jats:tr>\n                    <\/jats:tbody><\/jats:table><\/jats:table-wrap><\/jats:p>\n              <\/jats:sec>","DOI":"10.1007\/s00431-024-05596-2","type":"journal-article","created":{"date-parts":[[2024,6,19]],"date-time":"2024-06-19T07:03:42Z","timestamp":1718780622000},"page":"3885-3895","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["BODYFAT: a new calculator to determine the risk of being overweight validated in Spanish children between 11 and 17\u00a0years of age"],"prefix":"10.1007","volume":"183","author":[{"given":"Mar\u00eda Victoria","family":"Mart\u00edn-Miguel","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2937-9651","authenticated-orcid":false,"given":"Mar\u00eda Victoria","family":"Delgado-Mart\u00edn","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Carolina","family":"Barreiro-Arceiz","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ana","family":"Goicoechea-Casta\u00f1o","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sara","family":"Rodr\u00edguez-Pastoriza","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Clara","family":"Gonz\u00e1lez-Formoso","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mart\u00edn","family":"Fern\u00e1ndez-P\u00e9rez","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Clara","family":"Garc\u00eda-Cend\u00f3n","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Javier","family":"Roca","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ana","family":"Claver\u00eda","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2024,6,19]]},"reference":[{"key":"5596_CR1","unstructured":"World Health Organization (WHO). 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