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Journal of Environmental and Public Health
Volume 2010, Article ID 735613, 5 pages
http://dx.doi.org/10.1155/2010/735613
Research Article

The Association between the Availability of Sugar-Sweetened Beverage in School Vending Machines and Its Consumption among Adolescents in California: A Propensity Score Matching Approach

Department of Health Services, UCLA School of Public Health, 650 Charles E. Young Drive S., 61-253 CHS, Los Angeles, CA 90095, USA

Received 10 June 2010; Revised 31 August 2010; Accepted 31 August 2010

Academic Editor: David Vlahov

Copyright © 2010 Lu Shi. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

There is controversy over to what degree banning sugar-sweetened beverage (SSB) sales at schools could decrease the SSB intake. This paper uses the adolescent sample of 2005 California Health Interview Survey to estimate the association between the availability of SSB from school vending machines and the amount of SSB consumption. Propensity score stratification and kernel-based propensity score matching are used to address the selection bias issue in cross-sectional data. Propensity score stratification shows that adolescents who had access to SSB through their school vending machines consumed 0.170 more drinks of SSB than those who did not ( 𝑃 < . 0 5 ). Kernel-based propensity score matching shows the SSB consumption difference to be 0.158 on the prior day ( 𝑃 < . 0 5 ). This paper strengthens the evidence for the association between SSB availability via school vending machines and the actual SSB consumption, while future studies are needed to explore changes in other beverages after SSB becomes less available.