Challenges in the control of COVID-19 outbreaks caused by the delta variant during periods of low humidity: an observational study in Sydney, Australia

Table 5 Comparison of three multivariable models of the association between weather factors (14-day exponential moving average) and reported cases of COVID-19 caused by the B.1.617.2 (delta) variant of SARS-CoV-2, Sydney, Australia from 16 June to 10 September, 2021

Model	Parameter	AIC	Comparison	Likelihood ratio	P-value
1	Intercept	1,137.50	‒	‒	‒
1	9:00 am humidity	1,137.50	‒	‒	‒
2	Intercept	1,151.62	Model 2 vs Model 3	18.53	< 0.001
2	9:00 am temperature
3	Intercept	1,135.09	Model 1 vs Model 3	4.40	0.036
	9:00 am humidity
	9:00 am temperature
4	Intercept	1,119.64	Model 3 vs Model 4	17.46	< 0.001
	9:00 am humidity
	9:00 am temperature
	9:00 am humidity × 9:00 am temperature