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Med."],"abstract":"<jats:title>Abstract<\/jats:title>\n                  <jats:p>\n                    Body composition is a key component of health in both individuals and populations, and excess adiposity is associated with an increased risk of developing chronic diseases. Body mass index (BMI) and other clinical or commercially available tools for quantifying body fat (BF) such as DXA, MRI, CT, and photonic scanners (3DPS) are often inaccurate, cost prohibitive, or cumbersome to use. The aim of the current study was to evaluate the performance of a novel automated computer vision method, visual body composition (VBC), that uses two-dimensional photographs captured via a conventional smartphone camera to estimate percentage total body fat (%BF). The VBC algorithm is based on a state-of-the-art convolutional neural network (CNN). The hypothesis is that VBC yields better accuracy than other consumer-grade fat measurements devices. 134 healthy adults ranging in age (21\u201376 years), sex (61.2% women), race (60.4% White; 23.9% Black), and body mass index (BMI, 18.5\u201351.6\u2009kg\/m\n                    <jats:sup>2<\/jats:sup>\n                    ) were evaluated at two clinical sites (\n                    <jats:italic>N<\/jats:italic>\n                    \u2009=\u200964 at MGH,\n                    <jats:italic>N<\/jats:italic>\n                    \u2009=\u200970 at PBRC). Each participant had %BF measured with VBC, three consumer and two professional bioimpedance analysis (BIA) systems. The PBRC participants also had air displacement plethysmography (ADP) measured. %BF measured by dual-energy x-ray absorptiometry (DXA) was set as the reference against which all other %BF measurements were compared. To test our scientific hypothesis we run multiple, pair-wise Wilcoxon signed rank tests where we compare each competing measurement tool (VBC, BIA, \u2026) with respect to the same ground-truth (DXA). Relative to DXA, VBC had the lowest mean absolute error and standard deviation (2.16\u2009\u00b1\u20091.54%) compared to all of the other evaluated methods (\n                    <jats:italic>p<\/jats:italic>\n                    \u2009&lt;\u20090.05 for all comparisons). %BF measured by VBC also had good concordance with DXA (Lin\u2019s concordance correlation coefficient, CCC: all 0.96; women 0.93; men 0.94), whereas BMI had very poor concordance (CCC: all 0.45; women 0.40; men 0.74). Bland-Altman analysis of VBC revealed the tightest limits of agreement (LOA) and absence of significant bias relative to DXA (bias \u22120.42%,\n                    <jats:italic>R<\/jats:italic>\n                    <jats:sup>2<\/jats:sup>\n                    \u2009=\u20090.03;\n                    <jats:italic>p<\/jats:italic>\n                    \u2009=\u20090.062; LOA \u22125.5% to +4.7%), whereas all other evaluated methods had significant (\n                    <jats:italic>p<\/jats:italic>\n                    \u2009&lt;\u20090.01) bias and wider limits of agreement. Bias in Bland-Altman analyses is defined as the discordance between the y\u2009=\u20090 axis and the regressed line computed from the data in the plot. In this first validation study of a novel, accessible, and easy-to-use system, VBC body fat estimates were accurate and without significant bias compared to DXA as the reference; VBC performance exceeded those of all other BIA and ADP methods evaluated. The wide availability of smartphones suggests that the VBC method for evaluating %BF could play an important role in quantifying adiposity levels in a wide range of settings.\n                  <\/jats:p>\n                  <jats:p>\n                    <jats:bold>Trial registration<\/jats:bold>\n                    : ClinicalTrials.gov Identifier: NCT04854421.\n                  <\/jats:p>","DOI":"10.1038\/s41746-022-00628-3","type":"journal-article","created":{"date-parts":[[2022,6,29]],"date-time":"2022-06-29T07:07:45Z","timestamp":1656486465000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":63,"title":["Smartphone camera based assessment of adiposity: a validation study"],"prefix":"10.1038","volume":"5","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-8894-7981","authenticated-orcid":false,"given":"Maulik D.","family":"Majmudar","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Siddhartha","family":"Chandra","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kiran","family":"Yakkala","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Samantha","family":"Kennedy","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Amit","family":"Agrawal","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mark","family":"Sippel","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Prakash","family":"Ramu","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Apoorv","family":"Chaudhri","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Brooke","family":"Smith","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Antonio","family":"Criminisi","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Steven B.","family":"Heymsfield","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4616-533X","authenticated-orcid":false,"given":"Fatima Cody","family":"Stanford","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2022,6,29]]},"reference":[{"key":"628_CR1","doi-asserted-by":"publisher","first-page":"1301","DOI":"10.1161\/CIRCULATIONAHA.111.067264","volume":"126","author":"JP Despr\u00e9s","year":"2012","unstructured":"Despr\u00e9s, J. 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