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Journal of Pediatric Psychology Advance Access originally published online on August 8, 2006
Journal of Pediatric Psychology 2007 32(3):250-259; doi:10.1093/jpepsy/jsl024
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© The Author 2006. Published by Oxford University Press on behalf of the Society of Pediatric Psychology. All rights reserved. For permissions, please e-mail: journals.permissions@oxfordjournals.org

Socioeconomic Status, Race, and Body Mass Index: The Mediating Role of Physical Activity and Sedentary Behaviors during Adolescence

Margaret D. Hanson, MA and Edith Chen, PhD

Department of Psychology, University of British Columbia

All correspondence concerning this article should be addressed to Margaret D. Hanson, MA, Department of Psychology, University of British Columbia, Vancouver, BC, Canada. E-mail: hansonm{at}psych.ubc.ca.


  Abstract

Objective To assess how sociodemographic and activity behaviors contribute to adolescent body mass index (BMI). Methods One hundred and thirteen adolescents (M = 17 years; 42% Caucasian, 56% African American) were assessed on BMI. Teens reported activity levels and caregivers reported socioeconomic status (SES). Results Adolescents from lower SES backgrounds, and from minority groups, had higher BMI (r = –.26, p < .01 and t(110) = –3.01, p < .01). Formal statistical mediation tests revealed that sedentary behaviors significantly mediated the association between SES and BMI (Z = 2.31, p < .05), whereas physical activity significantly mediated the race–BMI association (Z = 2.32, p < .05). Conclusions Interventions targeting teen BMI could benefit by aiming to decrease sedentary behavior in low SES teens and increase physical activity in teens from minority groups.

Key words: adolescence; BMI; physical activity; sedentary behaviors; sociodemographics.

Received September 13, 2005; revision received January 18, 2006; revision received April 25, 2006; revision received June 26, 2006; accepted July 13, 2006


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