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