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Table 3 Preterm birth rate by PM2.5 levels in Ohio 2007 – 2010 and trimester of exposure in pregnancy

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

 

PM2.5 < 15 μg/m3

PM2.5 ≥ 15 μg/m3

 
 

n

% Preterm

n

% Preterm

p-value

First trimester

175,649

8.34

49,272

8.87

<0.001

Second trimester

185,883

8.47

39,038

8.43

0.835

Third trimester

181,665

8.08

43,256

10.05

<0.001

Entire pregnancy

200,259

8.27

24,662

9.99

<0.001

  1. % preterm represents the rate of birth <37 weeks of gestational age among the study cohort of singleton non-anomalous live births
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Environmental Health

ISSN: 1476-069X