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Table 2 Ambient pollutant exposure distributions among analysis sample

From: Interplay of gestational parent exposure to ambient air pollution and diet characteristics on preterm birth

 

Trimester

 

Mean

SD

 

Min

Q1

Median

Q3

Max

 

NO 2 (ppb) a

1 e

 

15.92

4.55

 

3.51

12.87

16.04

19.65

25.02

 
 

2 e

 

16.71

4.32

 

4.55

13.96

16.66

20.49

24.60

 
 

3 f

 

17.03

4.49

 

4.68

13.91

17.39

20.73

32.96

 

O 3 (ppb) b

1

 

41.90

7.93

 

27.71

34.16

44.49

49.01

52.19

 
 

2

 

40.94

8.17

 

26.78

32.12

42.59

48.88

53.86

 
 

3

 

41.52

7.68

 

20.54

34.08

42.76

48.91

55.61

 

Ensemble model PM 2.5 (µg/m 3 ) c

1

 

9.95

1.32

 

6.97

8.97

9.75

11.01

12.84

 
 

2

 

9.89

1.26

 

5.78

9.01

9.71

10.83

13.90

 
 

3

 

10.01

1.32

 

7.34

8.98

9.73

10.97

14.28

 

fCMAQ PM2.5 (µg/m 3 ) cd

1

 

10.05

1.47

 

7.16

8.75

9.64

11.35

13.22

 
 

2

 

9.99

1.38

 

7.20

8.97

9.58

11.05

13.86

 
 

3

 

10.01

1.40

 

7.42

8.93

9.52

11.04

14.24

 
  1. Abbreviations: SD = standard deviation; min = minimum; Q1 = quantile one (25th percentile); Q3 = quantile 3 (75th percentile); max = maximum
  2. a nitrogen dioxide (NO2) is reported as 1-hour daily maxima in parts per billion (ppb)
  3. b ozone (O3) is reported as 8-hour maxima in ppb
  4. c fine particulate matter (PM2.5) is reported as 24-hour average in micrograms (µg) per meter cubed.
  5. d fCMAQ estimates used in sensitivity analyses
  6. e n = 684
  7. f n = 682
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BMC Public Health

ISSN: 1471-2458

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