Table 3.

Results from the stage 1 model for emergency room visits for illnesses; p represents the p-value. Each model considered a constant sample size of 1460

Types of Illnesses	Variables	Mean Estimate	Standard Error	P
Gastrointestinal illness	Visit count on the previous day	0.003	0.000	< 0.001
	Monday	−0.022	0.010	0.032
	Tuesday	0.030	0.010	0.002
	Wednesday	0.115	0.010	< 0.001
	Thursday	0.047	0.010	< 0.001
	Friday	0.037	0.010	< 0.001
	O3	−0.619	0.314	0.049
	Average mean temperature	0.005	4.00*10−4	< 0.001
	Index of days	9.73*10−5	7.68*10−6	< 0.001
Respiratory illness	Visit count on the previous day	0.005	9.83*10−6	< 0.001
	Tuesday	−0.067	0.009	< 0.001
	Wednesday	−0.092	0.00932	< 0.001
	Thursday	−0.111	0.00916	< 0.001
	Friday	−0.099	0.00934	< 0.001
	Saturday	−0.030	0.00923	0.001
	School days	0.167	0.00855	< 0.001
	Holidays	−0.138	0.01624	< 0.001
	Precipitation	−0.001	3.00*10−4	0.004
	Index of days	−1.73*10−6	6.77*10−6	0.799
Dermal illness	Visit count on the previous day	0.002	0.001	0.010
	Tuesday	−0.094	0.017	< 0.001
	Wednesday	− 0.137	0.017	< 0.001
	Thursday	−0.178	0.017	< 0.001
	Friday	−0.189	0.018	< 0.001
	Holidays	−0.183	0.033	< 0.001
	O3	1.535	0.571	0.007
	NO2	0.002	0.001	0.006
	PM2.5	0.003	0.001	0.011
	Precipitation	−0.002	0.001	0.010
	Average mean temperature	0.008	0.001	< 0.001
	Index of days	8.10*10−5	1.73*10−5	< 0.001

Note: Holidays and each weekday (e.g., Monday, Tuesday, etc) are binary variables (Yes = 1, No = 0). For holidays, the value 1 was used as the reference, for each weekday, the value 0 was used as the reference