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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.