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Table 2 Distributions of participant air pollution exposure data and correlations between exposures (Spearman r)

From: Air pollution exposure and gestational diabetes mellitus among pregnant women in Massachusetts: a cohort study

  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
  1. aVehicles/day x km of road within 100 m of residential address