Table 2. Comparison of models that predict human WNV disease occurrence, CA, 2009–2018, ranked by Akaike Information Criterion (AIC).

Lower AIC values indicate better fit.

Model Components	ΔAIC
Overall Cx. pipiens complex risk level + offset(log(population)) + (1|VCA)	(referent)
Overall Cx. pipiens complex risk level + (1|VCA)	7.6
Overall Cx. tarsalis risk level + offset(log(population)) + (1|VCA)	61.2
Overall Cx. tarsalis risk level + (1|VCA)	677.9
Overall Cx. pipiens complex risk level + offset(log(population))	2,051.3
Overall Cx. pipiens complex risk level	2,118.0
Overall Cx. tarsalis risk level + offset(log(population))	2,489.0
Overall Cx. tarsalis risk level	2,842.8