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Table 1 Candidate factors, considered in both the Endemic Regions and Contiguous US models, along with their units, data sources, and spatial resolution

From: Factors associated with Anaplasma spp. seroprevalence among dogs in the United States

Category Factor(s) Scale Source
Climate Annual temperature (F) Division National Climate Data Center (NCDC)
Annual precipitation (in) Division NCDC
Annual relative humidity (%) Station NCDC
Geographic Elevation (ft) County http://www.cohp.org/
Percentage forest coverage (%) County United States Department of Agriculture (USDA)
Percentage surface water coverage (%) County US Census Bureau
Societal Population density (persons per square mile) County US Census Bureau
Median household income ($) County US Census Bureau
Prostriate Tick Amplification Deer/vehicle collisions (probability) State State Farm Insurance Company