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

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

	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

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.

ISSN: 1471-2393