Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/77752
Title: The uncertain geographic context problem in the analysis of the relationships between obesity and the built environment in guangzhou
Authors: Zhao, P 
Kwan, MP
Zhou, S
Keywords: Activity space
Built environment
Obesity
Regression analysis
UGCoP
Issue Date: 2018
Publisher: Molecular Diversity Preservation International (MDPI)
Source: International journal of environmental research and public health, 2018, v. 15, no. 2, 308 How to cite?
Journal: International journal of environmental research and public health 
Abstract: Traditionally, static units of analysis such as administrative units are used when studying obesity. However, using these fixed contextual units ignores environmental influences experienced by individuals in areas beyond their residential neighborhood and may render the results unreliable. This problem has been articulated as the uncertain geographic context problem (UGCoP). This study investigates the UGCoP through exploring the relationships between the built environment and obesity based on individuals’ activity space. First, a survey was conducted to collect individuals’ daily activity and weight information in Guangzhou in January 2016. Then, the data were used to calculate and compare the values of several built environment variables based on seven activity space delineations, including home buffers, workplace buffers (WPB), fitness place buffers (FPB), the standard deviational ellipse at two standard deviations (SDE2), the weighted standard deviational ellipse at two standard deviations (WSDE2), the minimum convex polygon (MCP), and road network buffers (RNB). Lastly, we conducted comparative analysis and regression analysis based on different activity space measures. The results indicate that significant differences exist between variables obtained with different activity space delineations. Further, regression analyses show that the activity space delineations used in the analysis have a significant influence on the results concerning the relationships between the built environment and obesity. The study sheds light on the UGCoP in analyzing the relationships between obesity and the built environment.
URI: http://hdl.handle.net/10397/77752
ISSN: 1661-7827
EISSN: 1660-4601
DOI: 10.3390/ijerph15020308
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