Field validation of listings of food stores and commercial physical activity establishments from secondary data
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BioMed Central
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Field validation of listings of food stores and commercial physical activity establishments from secondary data Catherine Paquet1,2,3, Mark Daniel*1,2,3, Yan Kestens3,4, Karine Léger3 and Lise Gauvin2,3,5 Address: 1School of Health Sciences, the University of South Australia, Adelaide, Australia, 2Département de médecine sociale et préventive, Université de Montréal, Québec, Canada, 3Axe santé des populations, Centre de recherche du Centre Hospitalier Universitaire de Montréal, Québec, Canada, 4Direction de Santé Publique de Montréal, Québec, Canada and 5Groupe de recherche interdisciplinaire en santé, Université de Montréal, Québec, Canada Email: Catherine Paquet - [email protected]; Mark Daniel* - [email protected]; Yan Kestens - [email protected]; Karine Léger - [email protected]; Lise Gauvin - [email protected] * Corresponding author
Published: 10 November 2008 International Journal of Behavioral Nutrition and Physical Activity 2008, 5:58
doi:10.1186/1479-5868-5-58
Received: 23 May 2008 Accepted: 10 November 2008
This article is available from: http://www.ijbnpa.org/content/5/1/58 © 2008 Paquet 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: Food- and activity-related establishments are increasingly viewed as neighbourhood resources that potentially condition health-related behaviour. The primary objective of the current study was to establish, using ground truthing (on-site verification), the validity of measures of availability of food stores and physical activity establishments that were obtained from commercial database and Internet searches. A secondary objective was to examine differences in validity results according to neighbourhood characteristics and commercial establishment categories. Methods: Lists of food stores and physical activity-related establishments in 12 census tracts within the Montreal metropolitan region were compiled using a commercial database (n = 171 establishments) and Internet search engines (n = 123 establishments). Ground truthing through field observations was performed to assess the presence of listed establishments and identify those absent. Percentage agreement, sensitivity (proportion of establishments found in the field that were listed), and positive predictive value (proportion of listed establishments found in the field) were calculated and contrasted according to data sources, census tracts characteristics, and establishment categories. Results: Agreement with field observations was good (0.73) for the commercial list, and moderate (0.60) for the Internet-based list. The commercial list was superior to the Internet-based list for correctly listing establishments present in the field (sensitivity),
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