Table 4.
Relative risk for multi-pollutants by quartile bins of concentrations during study period
|
Q 1 |
Q 2 |
Q 3 |
Q 4 |
|||
|---|---|---|---|---|---|---|
|
NO
2
*
|
NO
2
|
NO
2
|
NO
2
|
|||
|
≤ 7 ppb |
8-11 ppb |
11-15 ppb |
> 15 ppb |
|||
| Relative Risk and Confidence Interval | ||||||
|
Q 1 |
O
3
*
< 28 ppb |
Cases |
967 |
982 |
609 |
509 |
|
Days |
249 |
232 |
141 |
117 |
||
|
O
3
|
0.93 (0.91-0.94) |
0.91 (0.89-0.92) |
0.93 (0.92-0.94) |
0.93 (0.91-0.95) |
||
|
NO
2
|
0.55 (0.51-0.59) |
0.84 (0.81-0.86) |
0.96 (0.94-0.99) |
1.20 (1.17-1.23) |
||
|
Q 2 |
O
3
28-36 ppb |
Cases |
737 |
820 |
574 |
705 |
|
Days |
194 |
184 |
122 |
146 |
||
|
O
3
|
1.00 (0.99-1.02) |
1.00 (0.99-1.01) |
1.01 (1.00-1.02) |
1.00 (0.98-1.02) |
||
|
NO
2
|
0.45 (0.41-0.50) |
0.83 (0.80-0.86) |
0.96 (0.94-0.99) |
1.24 (1.21-1.27) |
||
|
Q 3 |
O
3
36-48 ppb |
Cases |
500 |
972 |
669 |
747 |
|
Days |
131 |
235 |
150 |
152 |
||
|
O
3
|
1.06 (1.05-1.07) |
1.04 (1.03-1.05) |
1.02 (1.01-1.03) |
1.02 (1.01-1.03) |
||
|
NO
2
|
0.56 (0.52-0.61) |
0.81 (0.79-0.83) |
1.03 (1.00-1.06) |
1.27 (1.24-1.30) |
||
| Q 4 | O 3 > 48 ppb |
Cases |
191 |
746 |
1074 |
952 |
|
Days |
48 |
189 |
245 |
217 |
||
|
O
3
|
1.13 (1.10-1.16) |
1.09 (1.08-1.11) |
1.07 (1.06-1.08) |
1.06 (1.04-1.07) |
||
| NO 2 | 0.76 (0.67-0.85) | 0.86 (0.83-0.90) | 1.12 (1.09-1.15) | 1.44 (1.38-1.50) | ||
*O3 Day Lag 0 to 2; NO2 Day Lag 0.