Table 5.
Estimates of change in asthma-related emergency/urgent and hospital visit counts for high versus low particulate matter with a diameter less than 10 μm (measured in μg/m3)
| Lag Structure for PM10* | Cut Point for PM10 (μg/m3) | Records Available for Analysis | Relative Increase in Hospital Count for “High” versus “Low” Pollution (%) | 95% CI | P Value |
|---|---|---|---|---|---|
| 3-d MA | 50 | 3,445 | 16.8 | 1.2 to 34.8 | 0.03 |
| 3-d MA | 100 | 3,445 | 65.8 | 20.2 to 128.7 | 0.002 |
| 5-d MA | 50 | 3,512 | 14.1 | −2.3 to 33.3 | 0.10 |
| 5-d MA | 100 | 3,512 | 45.0 | 2.7 to 104.8 | 0.03 |
Definition of abbreviations: CI = confidence interval; MA = moving average; PM10 = particulate matter with a diameter less than 10 μm.
*
Averaged days start from current day, for example, lagged 3-day MA includes current day plus previous 2 days.