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The control group is matched to the study population on important demographic variables: gender, age and residential area (postal code).
Participants were ranked according to their area postal code and assigned to a quintile based on the United Kingdom distribution of deprivation).
Aggregate data on SES were available at the level of the area postal code (www.cbs.nl) of the subject, weighted by population size and classified into three groups (high, intermediate and low).
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Distances from the participants' residences to the study centre were computed with Google maps (https://maps.google.com/) using area postal codes, as using addresses was not possible for reasons of privacy and data protection.
*ZIP code areas, US postal code areas.
As the discussion progressed, the children thought it might be best to make a sign with the area's postal code, E3, to include everyone.
Using forward sortation area data (postal code records) from each client's reported residence and a national dataset [ 8], clients were categorized by location as either local (within Edmonton Census Metropolitan Area; ECMA) or distant (beyond ECMA).
For non-rural areas, a postal code represents a relatively specific geographic area.
Socioeconomic status was estimated based on the average income associated with the participants' forward sortation area of postal codes (first three digits) using Statistics Canada's 2006 Canadian Census Statistics Canadaa, 2008).
In urban areas, 6-digit residential postal codes most often correspond to one side of a city block or to a single apartment building; in rural areas a single postal code may represent a larger area.
A resident was categorized as living in an urban area if his/her postal code was in a Census Metropolitan Area or Census Agglomeration with a population of 10,000 or more.
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