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Table 4 Percentile of RI and of birth weight between four groups according to urinary cotinine levels

From: Quantitative effects of tobacco smoking exposure on the maternal-fetal circulation

 

Cotinine

0

ng/mL

n = 30

Cotinine

< 50 ng/mL

n = 10

Cotinine

50 - 500 ng/mL

n = 14

Cotinine

>500 ng/mL

n = 10

P [1]

P [2]

RI Percentile

      

   RUA

42.8 ± 22.8

[10 a 90]

40.0 ± 25.7

[10 a 90]

55.3 ± 23.5

[10 a 90]

22.9 ± 22.9

[25 a 75]

0.201

0.267

   LUA

41.1 ± 20.8

[25 a 95]

42.5 ± 20.6

[25 a 75]

58.9 ± 15.8

[25 a 75]

52.5 ± 18.4

[25 a 75]

0.033

0.037

   UA

46.8 ± 20.1

[5 a 75]

46.0 ± 21.0

[10 a 75]

63.5 ± 14.6

[50 a 90]

68.5 ± 17.3

[50 a 95]

0.003

0.001

   MCA

45.3 ± 15.7

[5 a 75]

42.5 ± 16.8

[25 a 75]

36.8 ± 21.8

[5 a 75]

34.5 ± 23.8

[5 a 75]

0.321

0.14

Percentile of birth weight

45.6 ± 21.5

[3 a 90 ]

62.4 ± 24.4

[25 a 90]

36.6 ± 24.0

[3 a 90]

27.1 ± 22.8

[3 a 75]

0.006

0.007

  1. Data are represented as mean ± SD [minimum, maximum]. RI: vascular resistance index, RUA: right uterine artery, LUA: left uterine artery, UA: umbilical artery, MCA: middle cerebral artery. P: statistical significance, [1]: variance analysis - ANOVA - oneway, [2]: adjusted for age, number of pregnancies and AFI in ANCOVA model.