Table 6.
Percent change (95% CI) in stroke admissions associated with a 10.0 μg/m3 increase in NO2, SO2, and ozone, and 1.0 mg/m3 increase in CO after adjusting PM2.5 in cold seasons.
| Variables | Single-Pollutant Model | Model Adjusting PM2.5 | Z Value * | p Value * |
|---|---|---|---|---|
| NO2 | ||||
| Lag0 | 0.40 (0.02 to 0.78) | 0.72 (0.12 to 1.31) | −0.870 | 0.385 |
| Lag1 | −0.13 (−0.46 to 0.20) | −0.23 (−0.60 to 0.14) | 0.407 | 0.684 |
| Lag2 | −0.08 (−0.38 to 0.23) | −0.38 (−0.69 to −0.06) | 0.232 | 0.816 |
| 3 days average | −0.37 (−0.84 to 0.10) | −0.65 (−1.23 to −0.07) | 0.738 | 0.460 |
| SO2 | ||||
| Lag0 | 0.67 (0.35 to 1.00) | 0.76 (0.39 to 1.12) | −0.336 | 0.737 |
| Lag1 | 0.34 (0.04 to 0.64) | 0.39 (0.05 to 0.74) | −0.224 | 0.823 |
| Lag2 | 0.22 (−0.05 to 0.49) | 0.03 (−0.26 to 0.33) | 0.913 | 0.361 |
| 3 days average | 0.36 (−0.10 to 0.82) | 0.38 (−0.12 to 0.89) | −0.072 | 0.943 |
| CO | ||||
| Lag0 | 2.07 (1.20 to 2.95) | 4.13 (2.79 to 5.49) | −2.520 | 0.012 |
| Lag1 | 0.78 (0.04 to 1.52) | 0.69 (−0.11 to 1.51) | 0.146 | 0.884 |
| Lag2 | −0.25 (−0.94 to 0.45) | −0.62 (−1.33 to 0.10) | 0.736 | 0.461 |
| 3 days average | 0.56 (−0.50 to 1.64) | 0.77 (−0.50 to 2.05) | −0.242 | 0.809 |
| Ozone | ||||
| Lag0 | −2.06 (−2.39 to −1.73) | −2.23 (−2.57 to −1.90) | 0.732 | 0.464 |
| Lag1 | −1.48 (−1.78 to −1.18) | −1.54 (−1.85 to −1.22) | 0.265 | 0.791 |
| Lag2 | −1.44 (−1.73 to −1.15) | −1.32 (−1.63 to −1.02) | −0.547 | 0.584 |
| 3 days average | −1.90 (−2.35 to −1.45) | −2.12 (−2.58 to −1.65) | 0.652 | 0.514 |
CI, confidence interval; NO2, nitrogen dioxide; SO2, sulfur dioxide; CO, carbon monoxide; PM2.5, particulate matter that is 2.5 µm or less in diameter. * Test for difference between models.