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    Inverted BMI rather than BMI is a better proxy for percentage of body fat

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    Authors
    Nevill, Alan M.
    Stavropoulos-Kalinoglou, Antonios
    Metsios, Giorgos S.
    Koutedakis, Yiannis
    Holder, Roger L.
    Kitas, George D.
    Mohammed, Mohammed A.
    Issue Date
    2011
    
    Metadata
    Show full item record
    Abstract
    Background: Percentage of body fat (BF%) is a known risk factor for a range of healthcare problems but is difficult to measure. An easy to measure proxy is the weight/height2 ratio known as the Body Mass Index (BMI kg/m2). However, BMI does have some inherent weaknesses which are readily overcome by its inverse iBMI (1000/BMI, cm2/kg). Methods: The association between BF% and both BMI and iBMI together with their distributional properties was explored using previously published data from healthy (n ¼ 2993) and diseased populations (n ¼ 298). Results: BMI is skewed whereas iBMI is symmetrical and so is better approximated by the normal distribution. The relationship between BF% and BMI is curved, but that of iBMI and BF% is linear and thus iBMI explains more of the variation in BF% than BMI. For example a unit increase in BMI for a group of thin women represents an increase of 2.3% in BF, but for obese women this represents only a 0.3% increase in BF—a 7-fold difference. The curvature stems from body mass being the numerator in BMI but the denominator in BF% resulting in a form of hyperbolic curve which is not the case with iBMI. Furthermore, BMI and iBMI have different relationships (interaction) with BF% for men and women, but these differences are less marked with iBMI. Conclusions: Overall, these characteristics of iBMI favour its use over BMI, especially in statistical models
    Citation
    Annals of Human Biology
    Publisher
    Informa UK, Ltd.
    Journal
    Annals of Human Biology
    URI
    http://hdl.handle.net/2436/140269
    DOI
    10.3109/03014460.2011.606832
    Additional Links
    http://informahealthcare.com/doi/abs/10.3109/03014460.2011.606832
    Type
    Journal article
    Language
    en
    Description
    Published on-line ahead of print
    ISSN
    0301-4460
    1464-5033
    ae974a485f413a2113503eed53cd6c53
    10.3109/03014460.2011.606832
    Scopus Count
    Collections
    Faculty of Education, Health and Wellbeing

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