Table 2.
Descriptive statistics for average PM2.5 (µg/m3) exposures for participants for the pregnancy period and years 1–8
| Average PM2.5 | Mean | SD | Minimum | Median | Maximum | IQR |
|---|---|---|---|---|---|---|
| Pregnancy | 22.8 | 2.9 | 16.4 | 22.9 | 30.2 | 4.6 |
| Year 1 | 22.6 | 2.5 | 17.6 | 23.4 | 26.7 | 4.3 |
| Year 2 | 22.2 | 2.3 | 17.8 | 22.0 | 29.3 | 3.6 |
| Year 3 | 23.0 | 1.8 | 18.7 | 22.8 | 28.2 | 2.9 |
| Year 4 | 22.2 | 1.9 | 18.0 | 22.1 | 27.8 | 2.6 |
| Year 5 | 21.6 | 2.1 | 17.3 | 21.5 | 31.7 | 2.8 |
| Year 6 | 21.2 | 1.9 | 16.1 | 21.2 | 27.9 | 3.0 |
| Year 7 | 20.8 | 1.8 | 17.3 | 20.6 | 26.8 | 2.6 |
| Year 8 | 20.8 | 1.9 | 17.0 | 20.5 | 28.0 | 2.8 |
IQR indicates interquartile range; PM2.5, fine particulate matter; SD, standard deviation.