Degree of Accuracy of the BMI Z-Score to Determine Excess Fat Mass Using DXA in Children and Adolescents

Obesity is caused by fat accumulation. BMI Z-score is used to classify the different degrees of weight status in children and adolescents. However, this parameter does not always express the true percentage of body fat. Our objective was to determine the degree of agreement between the fat mass perc...

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Autores principales:	David Monasor-Ortolá, Jose Antonio Quesada-Rico, Ana Pilar Nso-Roca, Mercedes Rizo-Baeza, Ernesto Cortés-Castell, Asier Martínez-Segura, Francisco Sánchez-Ferrer
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	BMI Z-score childhood obesity body composition fat mass growth charts Medicine R
Acceso en línea:	https://doaj.org/article/d50a1245eb9846159ed080d6879479ac
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spelling	oai:doaj.org-article:d50a1245eb9846159ed080d6879479ac2021-11-25T17:51:16ZDegree of Accuracy of the BMI Z-Score to Determine Excess Fat Mass Using DXA in Children and Adolescents10.3390/ijerph1822121141660-46011661-7827https://doaj.org/article/d50a1245eb9846159ed080d6879479ac2021-11-01T00:00:00Zhttps://www.mdpi.com/1660-4601/18/22/12114https://doaj.org/toc/1661-7827https://doaj.org/toc/1660-4601Obesity is caused by fat accumulation. BMI Z-score is used to classify the different degrees of weight status in children and adolescents. However, this parameter does not always express the true percentage of body fat. Our objective was to determine the degree of agreement between the fat mass percentage measured by DXA and the stratification of weight according to BMI Z-score in the pediatric age group. We designed a descriptive cross-sectional study. The patients were classified as underweight/normal weight with Z-scores between −2 and +0.99, overweight from 1 to 1.99, obese from 2 to 2.99, and very obese ≥3. We included 551 patients (47% girls), with a mean age of 11.5 ± 2.8 years (3.7–18 years). Higher BMI Z-scores were associated with a higher percentage of total fat (<i>p</i> < 0.001). However, there were important overlaps between both parameters, such that the BMI Z-score classified patients with the same percentage of total fat mass as having a different nutritional status classification. In conclusion, the stratification of weight status according to BMI Z-score revealed that 46.7% of patients had a fat percentage that did not correspond to their classification. For a more accurate weight assessment in clinical practice, we recommend combining anthropometric indices with diagnostic tools that better correlate with DXA, such as electrical bioimpedance.David Monasor-OrtoláJose Antonio Quesada-RicoAna Pilar Nso-RocaMercedes Rizo-BaezaErnesto Cortés-CastellAsier Martínez-SeguraFrancisco Sánchez-FerrerMDPI AGarticleBMI Z-scorechildhood obesitybody compositionfat massgrowth chartsMedicineRENInternational Journal of Environmental Research and Public Health, Vol 18, Iss 12114, p 12114 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	BMI Z-score childhood obesity body composition fat mass growth charts Medicine R
spellingShingle	BMI Z-score childhood obesity body composition fat mass growth charts Medicine R David Monasor-Ortolá Jose Antonio Quesada-Rico Ana Pilar Nso-Roca Mercedes Rizo-Baeza Ernesto Cortés-Castell Asier Martínez-Segura Francisco Sánchez-Ferrer Degree of Accuracy of the BMI Z-Score to Determine Excess Fat Mass Using DXA in Children and Adolescents
description	Obesity is caused by fat accumulation. BMI Z-score is used to classify the different degrees of weight status in children and adolescents. However, this parameter does not always express the true percentage of body fat. Our objective was to determine the degree of agreement between the fat mass percentage measured by DXA and the stratification of weight according to BMI Z-score in the pediatric age group. We designed a descriptive cross-sectional study. The patients were classified as underweight/normal weight with Z-scores between −2 and +0.99, overweight from 1 to 1.99, obese from 2 to 2.99, and very obese ≥3. We included 551 patients (47% girls), with a mean age of 11.5 ± 2.8 years (3.7–18 years). Higher BMI Z-scores were associated with a higher percentage of total fat (<i>p</i> < 0.001). However, there were important overlaps between both parameters, such that the BMI Z-score classified patients with the same percentage of total fat mass as having a different nutritional status classification. In conclusion, the stratification of weight status according to BMI Z-score revealed that 46.7% of patients had a fat percentage that did not correspond to their classification. For a more accurate weight assessment in clinical practice, we recommend combining anthropometric indices with diagnostic tools that better correlate with DXA, such as electrical bioimpedance.
format	article
author	David Monasor-Ortolá Jose Antonio Quesada-Rico Ana Pilar Nso-Roca Mercedes Rizo-Baeza Ernesto Cortés-Castell Asier Martínez-Segura Francisco Sánchez-Ferrer
author_facet	David Monasor-Ortolá Jose Antonio Quesada-Rico Ana Pilar Nso-Roca Mercedes Rizo-Baeza Ernesto Cortés-Castell Asier Martínez-Segura Francisco Sánchez-Ferrer
author_sort	David Monasor-Ortolá
title	Degree of Accuracy of the BMI Z-Score to Determine Excess Fat Mass Using DXA in Children and Adolescents
title_short	Degree of Accuracy of the BMI Z-Score to Determine Excess Fat Mass Using DXA in Children and Adolescents
title_full	Degree of Accuracy of the BMI Z-Score to Determine Excess Fat Mass Using DXA in Children and Adolescents
title_fullStr	Degree of Accuracy of the BMI Z-Score to Determine Excess Fat Mass Using DXA in Children and Adolescents
title_full_unstemmed	Degree of Accuracy of the BMI Z-Score to Determine Excess Fat Mass Using DXA in Children and Adolescents
title_sort	degree of accuracy of the bmi z-score to determine excess fat mass using dxa in children and adolescents
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/d50a1245eb9846159ed080d6879479ac
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Degree of Accuracy of the BMI Z-Score to Determine Excess Fat Mass Using DXA in Children and Adolescents

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