The relationship between unsupervised time after school and physical activity in adolescent girls
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BioMed Central
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The relationship between unsupervised time after school and physical activity in adolescent girls Berenice R Rushovich*†1, Carolyn C Voorhees†1, CE Davis†2, Dianne Neumark-Sztainer†3, Karin A Pfeiffer†4, John P Elder†5, Scott Going†6 and Vivian G Marino†7 Address: 1Department of Public and Community Health, University of Maryland, College Park, Maryland, USA, 2Department of Biostatistics, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA, 3Division of Epidemiology and Community Health, School of Public Health, University of Minnesota, Minneapolis, MN, USA, 4Department of Exercise Science, University of South Carolina, Columbia, SC, USA, 5Graduate School of Public Health, San Diego State University, San Diego, CA, USA, 6Department of Nutritional Sciences, University of Arizona, Tucson, AZ, USA and 7Department of Biostatistics, Tulane University School of Public Health and Tropical Medicine, New Orleans, LA, USA Email: Berenice R Rushovich* - [email protected]; Carolyn C Voorhees - [email protected]; CE Davis - [email protected]; Dianne NeumarkSztainer - [email protected]; Karin A Pfeiffer - [email protected]; John P Elder - [email protected]; Scott Going - [email protected]; Vivian G Marino - [email protected] * Corresponding author †Equal contributors
Published: 31 July 2006 International Journal of Behavioral Nutrition and Physical Activity 2006, 3:20 5868-3-20
doi:10.1186/1479-
Received: 06 January 2006 Accepted: 31 July 2006
This article is available from: http://www.ijbnpa.org/content/3/1/20 © 2006 Rushovich 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: Rising obesity and declining physical activity levels are of great concern because of the associated health risks. Many children are left unsupervised after the school day ends, but little is known about the association between unsupervised time and physical activity levels. This paper seeks to determine whether adolescent girls who are without adult supervision after school are more or less active than their peers who have a caregiver at home. Methods: A random sample of girls from 36 middle schools at 6 field sites across the U.S. was selected during the fall of the 2002–2003 school year to participate in the baseline measurement activities of the Trial of Activity for Adolescent Girls (TAAG). Information was collected using sixday objectively measured physical activity, self-reported physical activity using a three-day recall, and socioeconomic and psychosocial measures. Complete information was available for 1422 out of a total of 1596 respondents. Categorical variables were analyzed using chi square and continuous variables were analyzed by ttests. The four categories of time alone were compared using a mixed linear model cont
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