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Table 1 Descriptive statistics of the estimates of individual exposure to ambient NO2 during the different pregnancy periods.

From: Air pollution exposure during pregnancy and reduced birth size: a prospective birth cohort study in Valencia, Spain

Pregnancy period

Mean (μg/m3)

Percentiles (μg/m3)

Pearson's correlation (r) between periods

  

25

50

75

First trimester

Second trimester

Third trimester

First trimester

37.9

28.2

38.1

48.5

   

Second trimester

35.9

26.5

35.2

44.2

0.69*

  

Third trimester

37.0

27.3

37.0

46.1

0.34*

0.65*

 

Whole pregnancy

36.9

29.4

37.9

45.6

0.80*

0.92*

0.83*

  1. *p < 0.001
  2. INMA-Valencia cohort, 2003-2006