Table 2

Air pollution concentrations prior to the FSIGT tests and pairwise correlations among air pollutants of the BetaGene cohort

Air pollutant exposuresNMean (SD)§Pairwise correlations
30-day cumulative averageAnnual averageTRAP
PM2.5NO2O3PM2.5NO2O3
30-day cumulative average
 PM2.5 (µg/m3)99216.8 (5.5)10.44 (<0.001)−0.02 (0.64)0.48 (<0.001)0.28 (<0.001)0.04 (0.25)0.01 (0.83)
 NO2 (ppb)99424.1 (6.8)1−0.37 (<0.001)0.56 (<0.001)0.71 (<0.001)−0.31 (<0.001)0.14 (<0.001)
 O3 (ppb)99643.4 (13.9)1−0.07 (0.019)−0.16 (<0.001)0.38 (<0.001)−0.09 (0.010)
Annual average
 PM2.5 (µg/m3)1,01617.4 (3.6)10.78 (<0.001)−0.30 (<0.001)0.14 (<0.001)
 NO2 (ppb)1,01825.6 (6.4)1−0.51 (<0.001)0.22 (<0.001)
 O3 (ppb)1,02340.8 (6.8)1−0.18 (<0.001)
TRAP modeled as freeway NOx (ppb)87417.0 (13.8)1
  • ppb, parts per billion.

  • †Pearson correlation r (P values) are presented.

  • §Means and SDs of air pollutant concentrations are presented.