Longitudinal Modelling of Body Mass Index from Birth to 14 YearsChivers P. · Hands B. · Parker H. · Beilin L. · Kendall G. · Bulsara M.
a School of Health Sciences, The University of Notre Dame Australia, Fremantle, b Centre for Child Health Research, Telethon Institute for Child Health Research, c Department of Medicine and Pharmacology, The University of Western Australia, d School for Nursing and Midwifery, Faculty of Health Sciences, Curtin University of Technology, Perth, e Institute for Health and Rehabilitation Research, The University of Notre Dame Australia, Fremantle, f School of Population Health, The University of Western Australia, Perth, Australia
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, and for 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 a powerful 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.
Paola Chivers, School of Health Sciences, The University of Notre Dame Australia, PO Box 1225, Fremantle, Western Australia 6959, Australia, Tel. +61 8 94330-200, Fax -210, email@example.com
Published online: September 10, 2009
Number of Print Pages : 9
Obesity Facts (The European Journal of Obesity)
Vol. 2, No. 5, Year 2009 (Cover Date: November 2009)
Journal Editor: Hebebrand J. (Essen)
ISSN: 1662-4025 (Print), eISSN: 1662-4033 (Online)
For additional information: http://www.karger.com/OFA