Table 2 Distributions of participant air pollution exposure data and correlations between exposures (Spearman r)
First trimester PM2.5 (μg/m3) | Second trimester PM2.5 (μg/m3) | Traffic densitya | |
|---|---|---|---|
Mean (SD) | 10.4 (1.7) | 10.4 (1.7) | 1,317 (2,025) |
Minimum | 3.1 | 1.3 | 0 |
Maximum | 17.1 | 19.3 | 37,306 |
Spearman r | |||
First trimester PM2.5 | 1.0 | -0.10 | 0.21 |
Second trimester PM2.5 | -0.10 | 1.0 | 0.20 |
Traffic density | 0.21 | 0.20 | 1.0 |