TABLE 4. Regression analysis excluding correlated confounders.
|
O3 regression results (713 obs.) |
NO2 regression results (232 obs.) |
CO regression results (168 obs.) |
SO2 regression results (241 obs.) |
|||||
|---|---|---|---|---|---|---|---|---|---|
Coeff. |
p-value |
Coeff. |
p-value |
Coeff. |
p-value |
Coeff. |
p-value |
||
X1 |
O3 |
0.857 |
<0.000*** |
|
|
|
|
|
|
|
NO2 |
|
|
0.002 |
<0.000*** |
|
|
|
|
|
CO |
|
|
|
|
0.002 |
0.619 |
|
|
|
SO2 |
|
|
|
|
|
|
-0.00002 |
0.662 |
X2 Median household income |
|
|
|
|
-0.000 |
0.277 |
0.0000004 |
0.004** |
|
X3 Rate of hospital beds |
0.004 |
0.368 |
-0.002 |
0.879 |
-0.016 |
0.270 |
-0.004 |
0.591 |
|
X4 Population density |
|
|
|
|
0.000 |
<0.000*** |
0.00001 |
<0.000*** |
|
X5 Days since first confirmed case |
|
|
|
|
|
|
|
|
|
|
Adjusted R-squared |
|
0.033 |
|
0.074 |
|
0.354 |
|
0.540 |
|
Source: Prepared by authors from study data.
Note: obs., observations; coeff., coefficient; significance level: *** p < 0.001, ** p < 0.01, * p < 0.05