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Table 3 Percentile of RI and of birth weight between four groups according to carbon monoxide exhaled concentration

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

  COex
0 ppm
n = 21
COex
1 - 4 ppm
n = 21
COex
5 - 9 ppm
n = 9
COex
≥ 10 ppm
n = 13
P [1] P [2]
RI Percentile       
   RUA 36.2 ± 21.8
[10 a 90]
46.9 ± 20.3
[10 a 75]
44.4 ± 28.9
[10 a 90]
66.5 ± 17.5
[25 a 90]
0.003 <0.001
   LUA 39.3 ± 18.7
[25 a 75]
40.5 ± 16.8
[25 a 75]
52.8 ± 19.5
[25 a 75]
66.1 ± 16.7
[50 a 95]
<0.001 <0.001
   UA 44.5 ± 21.3
[10 a 75]
49.1 ± 17.9
[5 a 75]
61.1 ± 13.1
[50 a 75]
71.1 ± 16.2
[50 a 95]
0.001 <0.001
   MCA 46.4 ± 14.3
[25 a 75]
42.1 ± 17.1
[5 a 75]
47.2 ± 19.5
[25 a 75]
27.7 ± 22.2
[5 a 75]
0.022 <0.001
Percentile of birth weight 49.05 ± 22.7
[10 a 90]
49.90 ± 25.8
[3 a 90]
41.2 ± 25.3
[3 a 75]
25.1 ± 16.6
[3 a 50]
0.017 <0.001
  1. Data are represented as mean ± SD [minimum, maximum]. COex: concentration of carbon monoxide in the exhaled air, 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]: linear tendency obtained in regression model.