Table 2.
Relative increase in odds of a transmural infarction associated with each IQR increase in PM2.5 concentration, by exposure Tier. Z-score method. For Tier 1, IQR refers to the interquartile range of z-scores, while for the refined exposure models (Tiers 2a, 2b, and 3), it refers to the interquartile range of the z-score difference (e.g., the difference between the Tier 1 and Tier 2a z-scores).
| Tier | IQR | N | OR | 95% CI | p-value |
|---|---|---|---|---|---|
| Tier 1 | 1.22 | 1561 | 1.11 | 1.00, 1.23 | 0.04 |
| Tier 2a SHEDS | 0.25 | 1.03 | 0.90, 1.18 | 0.65 | |
|
| |||||
| Tier 1 | 1.22 | 1552* | 1.12 | 1.02, 1.23 | 0.02 |
| Tier 2b APP | 0.21 | 1.05 | 0.97, 1.14 | 0.21 | |
|
| |||||
| Tier 1 | 1.22 | 1561 | 1.12 | 1.03, 1.22 | 0.01 |
| Tier 3 HYBRID | 0.18 | 1.05 | 0.99, 1.11 | 0.12 | |
*
Subjects were excluded if there was a period of more than nine days between STN PM2.5 species concentration measurements for the case period or all control periods