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    Longitudinal Modelling of Body Mass Index from Birth to 14 Years

    134597_134597.pdf (1.144Mb)
    Access Status
    Open access
    Authors
    Chivers, P.
    Hands, B.
    Parker, H.
    Beilin, L.
    Kendall, Garth
    Bulsara, Max
    Date
    2009
    Type
    Journal Article
    
    Metadata
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    Citation
    Chivers, Paolo and Hands, Beth and Parker, Helen and Beilin, Lawrence and Kendall, Garth and Bulsara, Max. 2009. Longitudinal Modelling of Body Mass Index from Birth to 14 Years. Obesity Facts. 2 (5): pp. 302-310.
    Source Title
    Obesity Facts
    DOI
    10.1159/000235561
    ISSN
    1662-4025
    Faculty
    School of Nursing and Midwifery
    Faculty of Health Sciences
    URI
    http://hdl.handle.net/20.500.11937/40068
    Collection
    • Curtin Research Publications
    Abstract

    Background: To examine the tracking of BMI from birth to age 14 years. Participants and Methods: Linear mixed model (LMM) analysis was used to model the trajectories of BMI (n = 1,403). Adiposity rebound was investigated for a subset of individuals (n = 173). Results: Adolescents who were overweight or obese at 14 years followed a different BMI trajectory from birth compared to those of normal weight. There was a difference between weight status groups for the timing of adiposity rebound (p <0.001) and BMI at nadir (p <0.001). The LMM depicted a significant difference in rate of change of BMI over time for males and females (p <0.001), with female BMI increasing at a faster rate, andfor weight status groups (p <0.005), with the obese cohort having the faster increase in BMI over time. BMI at birth was significantly lower for the normal weight cohort compared to the overweight (p = 0.029) and obese (p = 0.019) cohorts. Conclusion: This study introduces apowerful analytic tool, LMM, to model BMI and shows that weight status at 14 years is the result of a distinct path in earlier years. Compared to their normal weight peers, overweight and obese adolescents experience an earlier adiposity rebound, with a higher BMI at rebound.

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