Table 1 Factors purported to influence Ehrlichia seroprevalence in domestic dogs. For further discussion, including the source of each factor, see [18, 20]
| Â | Factor | Data period | Scale | Notation | Numerical scale of data |
|---|---|---|---|---|---|
Climate factors | Annual temperature | 1895–2015 | Climate Division | X s,1 (t) | Continuous |
|  | Annual precipitation | 1895–2015 | Climate Division | X s,2 (t) |  |
|  | Annual relative humidity | 2006–2015 | Climate Division | X s,3 (t) |  |
Geographical factors | Elevation | 2012 | County | X s,4 (t) | Continuous |
| Â | Percentage forest coverage | 2012 | County | X s,5 (t) | Â |
| Â | Percentage surface water coverage | 2010 | County | X s,6 (t) | Â |
Societal factors | Population density | 2011–2014 | County | X s,7 (t) | Continuous |
|  | Median household income | 1997–2014 | County | X s,8 (t) |  |