Predictors of initiation and persistence of unhealthy weight control behaviours in adolescents
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Predictors of initiation and persistence of unhealthy weight control behaviours in adolescents Jennifer A Linde*1, Melanie M Wall2, Jess Haines3 and Dianne NeumarkSztainer1 Address: 1Division of Epidemiology and Community Health, School of Public Health, University of Minnesota, Minneapolis, MN, USA, 2Division of Biostatistics, School of Public Health, University of Minnesota, Minneapolis, MN, USA and 3Department of Ambulatory Care and Prevention, Harvard Medical School/Harvard Pilgrim Health Care, Boston, MA, USA Email: Jennifer A Linde* - [email protected]; Melanie M Wall - [email protected]; Jess Haines - [email protected]; Dianne Neumark-Sztainer - [email protected] * Corresponding author
Published: 29 October 2009 International Journal of Behavioral Nutrition and Physical Activity 2009, 6:72
doi:10.1186/1479-5868-6-72
Received: 19 March 2009 Accepted: 29 October 2009
This article is available from: http://www.ijbnpa.org/content/6/1/72 © 2009 Linde et al; licensee BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract Background: Unhealthy weight control behaviours (UWCB) among adolescents have significant health and weight consequences. The current longitudinal study aimed to identify personal and socioenvironmental predictors of initiation or persistence of adolescent UWCB, in order to inform development of programs aimed at both preventing and stopping UWCB. Methods: A diverse sample included 1106 boys and 1362 girls from 31 middle schools and high schools in the United States who were enrolled in Project EAT (Eating Among Teens). Project EAT explored personal, behavioural, and socio-environmental factors associated with dietary intake and body weight in adolescence. Participants completed questionnaires to assess demographics, UWCB (including several methods of food restriction, purging by vomiting or medications, smoking to control weight, or food substitutions) and personal and socio-environmental variables at two time points, five years apart, between 1998 and 2004. Logistic regression models examined personal and socio-environmental predictors of initiation and persistence of UWCB among Project EAT participants. Results: Results indicate that 15.5% of boys and 19.7% of girls initiated UWCB by Time 2, and 15.9% of boys and 43.3% of girls persisted with these behaviours from Time 1 to Time 2. After controlling for race/ ethnicity and weight status changes between assessments, logistic regression models indicated that similar factors and patterns of factors were associated significantly with initiation and persistence of UWCB. For both boys and girls, personal factors had more predictive value than socio-environmental factors (Initiation models: for boys: R2 = 0.35 for personal vs. 0.27 for socio-environ
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