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Differences in the relationship of weight to height, and thus the meaning of BMI, according to age, sex, and birth year cohort
Background: Weight can be adjusted for height using the Benn parameter (kg/m(B)), where B is the power that minimises the correlation with height. Aim: To investigate how the Benn parameter changes across age (10–65 years) and time (1956–2015) and differs between sexes. Subjects and methods: The sam...
Autores principales: | , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Taylor & Francis
2020
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7261404/ https://www.ncbi.nlm.nih.gov/pubmed/32429756 http://dx.doi.org/10.1080/03014460.2020.1737731 |
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author | Johnson, William Norris, Tom Bann, David Cameron, Noël Wells, Jonathan K. Cole, Tim J. Hardy, Rebecca |
author_facet | Johnson, William Norris, Tom Bann, David Cameron, Noël Wells, Jonathan K. Cole, Tim J. Hardy, Rebecca |
author_sort | Johnson, William |
collection | PubMed |
description | Background: Weight can be adjusted for height using the Benn parameter (kg/m(B)), where B is the power that minimises the correlation with height. Aim: To investigate how the Benn parameter changes across age (10–65 years) and time (1956–2015) and differs between sexes. Subjects and methods: The sample comprised 49,717 individuals born in 1946, 1958, 1970 or 2001. Cross-sectional estimates of the Benn parameter were produced and cohort differences at ages 10/11 and 42/43 years were examined using linear regression. Multilevel modelling was used to develop trajectories showing how the Benn parameter changed over age from childhood to mid-adulthood in the three older cohorts. Results: The Benn parameter was closest to 2 in childhood but consistently lower across adulthood, particularly in females and the most recent cohort. At ages 10/11 years, the Benn parameter was greater than 3 in both sexes in the 2001 cohort but between 2.2 and 2.7 in the three older cohorts. This difference was estimated to be +0.67 (0.53, 0.81) in males and +0.53 (0.38, 0.68) in females, compared to the 1946 cohort, and was driven by a much higher weight SD in the 2001 cohort. Conversely, at ages 42/43 years, the Benn parameter was lowest in the 1970 cohort due to a slightly lower weight-height correlation. This difference was estimated to be −0.12 (−0.34, 0.10) in males and −0.15 (−0.42, 0.13) in females, compared to the 1946 cohort. Conclusions: Changes over time in the obesogenic environment appear to have firstly reduced the Benn parameter due to a lowering of the weight-height correlation but secondly and more drastically increased the Benn parameter due to increasing weight variation. |
format | Online Article Text |
id | pubmed-7261404 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2020 |
publisher | Taylor & Francis |
record_format | MEDLINE/PubMed |
spelling | pubmed-72614042020-06-11 Differences in the relationship of weight to height, and thus the meaning of BMI, according to age, sex, and birth year cohort Johnson, William Norris, Tom Bann, David Cameron, Noël Wells, Jonathan K. Cole, Tim J. Hardy, Rebecca Ann Hum Biol Research Papers Background: Weight can be adjusted for height using the Benn parameter (kg/m(B)), where B is the power that minimises the correlation with height. Aim: To investigate how the Benn parameter changes across age (10–65 years) and time (1956–2015) and differs between sexes. Subjects and methods: The sample comprised 49,717 individuals born in 1946, 1958, 1970 or 2001. Cross-sectional estimates of the Benn parameter were produced and cohort differences at ages 10/11 and 42/43 years were examined using linear regression. Multilevel modelling was used to develop trajectories showing how the Benn parameter changed over age from childhood to mid-adulthood in the three older cohorts. Results: The Benn parameter was closest to 2 in childhood but consistently lower across adulthood, particularly in females and the most recent cohort. At ages 10/11 years, the Benn parameter was greater than 3 in both sexes in the 2001 cohort but between 2.2 and 2.7 in the three older cohorts. This difference was estimated to be +0.67 (0.53, 0.81) in males and +0.53 (0.38, 0.68) in females, compared to the 1946 cohort, and was driven by a much higher weight SD in the 2001 cohort. Conversely, at ages 42/43 years, the Benn parameter was lowest in the 1970 cohort due to a slightly lower weight-height correlation. This difference was estimated to be −0.12 (−0.34, 0.10) in males and −0.15 (−0.42, 0.13) in females, compared to the 1946 cohort. Conclusions: Changes over time in the obesogenic environment appear to have firstly reduced the Benn parameter due to a lowering of the weight-height correlation but secondly and more drastically increased the Benn parameter due to increasing weight variation. Taylor & Francis 2020-05-20 /pmc/articles/PMC7261404/ /pubmed/32429756 http://dx.doi.org/10.1080/03014460.2020.1737731 Text en © 2020 The Author(s). Published by Informa UK Limited, trading as Taylor & Francis Group https://creativecommons.org/licenses/by/4.0/This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) ), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. |
spellingShingle | Research Papers Johnson, William Norris, Tom Bann, David Cameron, Noël Wells, Jonathan K. Cole, Tim J. Hardy, Rebecca Differences in the relationship of weight to height, and thus the meaning of BMI, according to age, sex, and birth year cohort |
title | Differences in the relationship of weight to height, and thus the meaning of BMI, according to age, sex, and birth year cohort |
title_full | Differences in the relationship of weight to height, and thus the meaning of BMI, according to age, sex, and birth year cohort |
title_fullStr | Differences in the relationship of weight to height, and thus the meaning of BMI, according to age, sex, and birth year cohort |
title_full_unstemmed | Differences in the relationship of weight to height, and thus the meaning of BMI, according to age, sex, and birth year cohort |
title_short | Differences in the relationship of weight to height, and thus the meaning of BMI, according to age, sex, and birth year cohort |
title_sort | differences in the relationship of weight to height, and thus the meaning of bmi, according to age, sex, and birth year cohort |
topic | Research Papers |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7261404/ https://www.ncbi.nlm.nih.gov/pubmed/32429756 http://dx.doi.org/10.1080/03014460.2020.1737731 |
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