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Table 1 Variables that were constructed and considered during the model building process

From: A geographic identifier assignment algorithm with Bayesian variable selection to identify neighborhood factors associated with emergency department visit disparities for asthma

VariableDescriptionLevelTypeTimeSource
Outcome
 CountAsthma ED visit countCensus tractCount1999–2015SCRFA
Demographics
 PERC_WPercent of the population white raceCensus tractContinuous2010US Census
 Per_YouPercent of the population ages 5–19Census tractContinuous2010US Census
 Per_MalPercent of the population maleCensus tractContinuous2010US Census
 Per_highPercent of the population graduated high schoolCensus tractContinuous2010US Census
 POV100Percent of the population < 100% federal poverty level (FPL)Census tractContinuous2010US Census
 hmedincHousehold median income (scaled by $1 k)Census tractContinuous2010US Census
 propmissAverage annual proportion of census tract identifiers missingCensus tractContinuous1999–2015SCRFA
Weather
 TempAverage annual temperature (℃)Census tractContinuous1999–2015PRISM
 DewpAverage annual dewpoint temperature (°C)Census tractContinuous1999–2015PRISM
Air pollutants
 COAverage annual CO concentration (ppm)Census tractContinuous1999–2015CACES
 NO2Average annual NO2 concentration (ppb)Census tractContinuous1999–2015CACES
 O3Average annual O3 concentration (ppb)Census tractContinuous1999–2015CACES
 SO2Average annual SO2 concentration (ppb)Census tractContinuous1999–2015CACES
 PM25Average annual PM2.5 concentration (μg/m3)Census tractContinuous1999–2015CACES
 PM10Average annual PM10 concentration (μg/m3)Census tractContinuous1999–2015CACES
Social
 Pharm_kmDistance to nearest pharmacy (km)Census tractContinuous2017SCBOP
 tot_hourTotal hours worked in primary care by health professionalsCountyContinuous2018SCRFA
 PER_VACPercent houses vacantCensus tractContinuous2010US Census
 PPL_HOUSEAverage people per houseCensus tractContinuous2010US Census
 Per_UrbPercent of the population urbanCensus tractContinuous2010US Census
 Ped_Per_UnPercent of the pediatric population on public insuranceCensus tractContinuous2010US Census
 Pop_km2Population density (people/km2)Census tractContinuous2010US Census
Environmental confounders
 Ag_countAgricultural facility countCensus tractCount2018SCDHEC
 Road_km2Road density (km road/km2 census tract area)Census tractContinuous2018SCDOT
 maj_kmDistance to nearest major air pollutant emitting facility (km)Census tractContinuous2017US EPA
 maj_ang_radDirection to nearest major air pollutant emitting facility (radians)Census tractContinuous2017US EPA
 pow_kmDistance to nearest fossil fuel burning power plant (km)Census tractContinuous2017US EPA
 pow_ang_radDirection to nearest fossil fuel burning power plant (radians)Census tractContinuous2017US EPA
  1. CASES Center for Air, Climate, and Energy Solutions [75], PRISM Climate Group [76], ACS 2010 US Census and 2010 American Community Survey [77], SCRFA South Carolina Revenue and Fiscal Affairs, SCBOP South Carolina Board of Pharmacy, SCDOT South Carolina Department of Transportation, SCDHEC South Carolina Department of Health and Environmental Control, EPA Environmental Protection Agency