Table 2.

Exogenous variables.

Factors	Variables	Explanation
Disease Outbreak	COVID lockdown	Denoting whether the COVID lockdown was in place or not in Michigan
Climatic	Average temperature	The average temperature (K)
	Minimum temperature	The minimum temperature (K)
	Maximum temperature	The maximum temperature (K)
	Precipitation	Quantity of water deposited (i.e., rain, snow, or hail)
	Relative humidity	Percentage of relative humidity
	Pressure	Pressure within the earth atmosphere (Hg)

Note: K—Kelvin, Hg—Barometric pressure.