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Table 2 PM2.5 levels in Ohio 2007 – 2010, by trimester of exposure in pregnancy and preterm status

From: Exposure to airborne particulate matter during pregnancy is associated with preterm birth: a population-based cohort study

  Preterm births N = 19,027 Term births N = 205,894   All live births N = 224,921
  % PM2.5 ≥ 15 μg/m3 % PM2.5 ≥ 15 μg/m3 p-value % PM2.5 ≥ 15 μg/m3
First trimester 22.97 21.81 <0.001 21.91
Second trimester 17.30 17.36 0.835 17.36
Third trimester 22.84 18.90 <0.001 19.23
Entire pregnancy 12.94 10.78 <0.001 10.96
  1. % PM2.5 ≥ 15 μg/m3 = percent of births in Ohio with average exposure level exceeding the EPA standard of 15 μg/m3