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Table 1 Summary statistics for PM2.5 levels in the study groups and overall

From: Household air pollution, ultrasound measurement, fetal biometric parameters and intrauterine growth restriction

 

Intervention

Control

All

2nd trimester mean 72-h PM2.5 quartile

Median

(min, max)

n

Median

(min, max)

n

Median

(min, max)

n

Q1

20.3 (5.5–25.1)

32

21.5 (12.8–26.6)

26

20.6 (5.5–26.6)

58

Q2

32.3 (27–40.0)

29

33.0 (27.0–40.5)

29

32.9 (27.0–40.5)

58

Q3

52.5 (40.9–66.5)

28

51.4 (41.3–67.6)

30

51.8 (40.9–67.6)

58

Q4

166.3 (69.6–437.8)

27

161.5 (69.6–437.8)

31

162.6 (69.6–437.8)

58

3rd trimester mean 72-h PM2.5 quartile

 Q1

26.1 (0.7–32.3)

28

22.0 (8.8–31.3)

24

23.8 (0.7–32.3)

52

 Q2

39.7 (32.7–48.2)

26

40.9 (33.9–48.9)

26

40.1 (32.7–48.9)

52

 Q3

62.8 (49.2–106.8)

27

71.5 (49.5–113.8)

25

64.5 (49.2–113.8)

52

 Q4

189.8 (122.2–890.5)

24

186.3 (117.1–698.6)

27

186.4 (117.0–890.5)

51

  1. n sample size; min minimum; max maximum