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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

Variable Description Level Type Time Source
Outcome
 Count Asthma ED visit count Census tract Count 1999–2015 SCRFA
Demographics
 PERC_W Percent of the population white race Census tract Continuous 2010 US Census
 Per_You Percent of the population ages 5–19 Census tract Continuous 2010 US Census
 Per_Mal Percent of the population male Census tract Continuous 2010 US Census
 Per_high Percent of the population graduated high school Census tract Continuous 2010 US Census
 POV100 Percent of the population < 100% federal poverty level (FPL) Census tract Continuous 2010 US Census
 hmedinc Household median income (scaled by $1 k) Census tract Continuous 2010 US Census
 propmiss Average annual proportion of census tract identifiers missing Census tract Continuous 1999–2015 SCRFA
Weather
 Temp Average annual temperature (℃) Census tract Continuous 1999–2015 PRISM
 Dewp Average annual dewpoint temperature (°C) Census tract Continuous 1999–2015 PRISM
Air pollutants
 CO Average annual CO concentration (ppm) Census tract Continuous 1999–2015 CACES
 NO2 Average annual NO2 concentration (ppb) Census tract Continuous 1999–2015 CACES
 O3 Average annual O3 concentration (ppb) Census tract Continuous 1999–2015 CACES
 SO2 Average annual SO2 concentration (ppb) Census tract Continuous 1999–2015 CACES
 PM25 Average annual PM2.5 concentration (μg/m3) Census tract Continuous 1999–2015 CACES
 PM10 Average annual PM10 concentration (μg/m3) Census tract Continuous 1999–2015 CACES
Social
 Pharm_km Distance to nearest pharmacy (km) Census tract Continuous 2017 SCBOP
 tot_hour Total hours worked in primary care by health professionals County Continuous 2018 SCRFA
 PER_VAC Percent houses vacant Census tract Continuous 2010 US Census
 PPL_HOUSE Average people per house Census tract Continuous 2010 US Census
 Per_Urb Percent of the population urban Census tract Continuous 2010 US Census
 Ped_Per_Un Percent of the pediatric population on public insurance Census tract Continuous 2010 US Census
 Pop_km2 Population density (people/km2) Census tract Continuous 2010 US Census
Environmental confounders
 Ag_count Agricultural facility count Census tract Count 2018 SCDHEC
 Road_km2 Road density (km road/km2 census tract area) Census tract Continuous 2018 SCDOT
 maj_km Distance to nearest major air pollutant emitting facility (km) Census tract Continuous 2017 US EPA
 maj_ang_rad Direction to nearest major air pollutant emitting facility (radians) Census tract Continuous 2017 US EPA
 pow_km Distance to nearest fossil fuel burning power plant (km) Census tract Continuous 2017 US EPA
 pow_ang_rad Direction to nearest fossil fuel burning power plant (radians) Census tract Continuous 2017 US 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