Table 2.
Levels of exposure to regional air pollutants NO2, O3, PM2.5 and PM10 for 1-month and 1-year before study visit.
| Summary | ||
|---|---|---|
| Air Pollution | Na | Mean (SD) |
| 1 month NO2 (ppb) | 117 | 15.6 (5.1) |
| 1 month O3 (ppb) | 119 | 50.6 (14.6) |
| 1 month PM2.5 (μg/m3) | 119 | 12.6 (4.4) |
| 1 month PM10 (μg/m3) | 119 | 31.3 (11.5) |
| 1 year NO2 (ppb) | 134 | 15.8 (3.7) |
| 1 year O3 (ppb) | 136 | 49.1 (6.3) |
| 1 year PM2.5 (μg/m3) | 136 | 12.3 (2.5) |
| 1 year PM10 (μg/m3) | 136 | 31.2 (8.2) |
a
The number (N) of participants with valid air pollution exposure, the number (N) is less than 136 due to missingness of air pollution exposure assessment.