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"Variable Name","Variable ID","Variable Description",Version,"dbGaP Mapping" PX741301_Tobacco_Retailer_Density_Residence,PX741202010000,"What is the number of tobacco retailers within 500 meter and 1 kilometer service areas around each participant address?",0,https://www.phenxtoolkit.org/protocols/view/741202 PX741301_Tobacco_Retailer_Density_Residence_Calculated,PX741202020000,"What is the density? (Divide count by land area for each buffer. Land area is to be extracted from Census 2010 data)",0,https://www.phenxtoolkit.org/protocols/view/741202 PX741301_Tobacco_Retailer_Proximity_Residence,PX741202030000,"Using the ArcGIS Closest Facility tool, what is the calculated roadway distance (in meters) from each participant to the nearest tobacco retailer?",0,https://www.phenxtoolkit.org/protocols/view/741202