Table 3 Spearman correlation coefficients among the exposure variables.
From: Short-term Effect of Ambient Ozone on Daily Emergency Room Visits in Beijing, China
Variables | ozone | PM2.5 | PM10 | NO2 | SO2 | CO | Temp | RH |
|---|---|---|---|---|---|---|---|---|
ozone | 1.00 | −0.03 | 0.03 | −0.34a | −0.30a | −0.29a | 0.84a | 0.04 |
PM2.5 | — | 1.00 | 0.83a | 0.66a | 0.53a | 0.85a | −0.06 | 0.46a |
PM10 | — | — | 1.00 | 0.68a | 0.62a | 0.67a | −0.04 | 0.13b |
NO2 | — | — | — | 1.00 | 0.66a | 0.74a | −0.32a | −0.16a |
SO2 | — | — | — | — | 1.00 | 0.64a | −0.49a | −0.25a |
CO | — | — | — | — | — | 1.00 | −0.29a | 0.41a |
Temp | — | — | — | — | — | — | 1.00 | 0.23a |
RH | — | — | — | — | — | — | — | 1.00 |
