Table 2.

Coefficients between hospital visits and air pollutants using least absolute shrinkage and selection operator (LASSO).

		PM10	PM2.5	O3	NO2	CO	SO2
Outpatient Hospital Visits	4-day lag	0.016	0	−0.032	0.05	0	−0.002
	3-day lag	0	0	0	0.027	−0.008	−0.010
	2-day lag	0.010	−0.012	0	0.082	−0.009	0
	1-day lag	0	−0.002	0	−0.038	0	0
	0-day lag	0.020	0	−0.028	0.050	0	0
Hospital Admissions	4-day lag	0.010	0.015	−0.013	0.042	0	−0.011
	3-day lag	0.001	0	0.004	0	0	−0.011
	2-day lag	0.015	0	0	0.016	0.004	0
	1-day lag	0	0	0	−0.065	0.066	−0.022
	0-day lag	0.020	0.020	−0.008	0.024	0	−0.024
Emergency Department Visits	4-day lag	0.022	0	−0.010	0.019	0	0
	3-day lag	0	0	−0.006	0.007	0	0
	2-day lag	0.011	0	0	0.016	0.005	0
	1-day lag	0.005	0	0	0	0	−0.003
	0-day lag	0.021	−0.009	0	0.010	0.012	0