Demographic and clinical characteristics of study group as a function of median steps per day: ≤ 25^th percentile vs. > 75^th percentile.

<p>Demographic and clinical characteristics of study group as a function of median steps per day: ≤ 25^th percentile vs. > 75^th percentile.</p

Regression analysis of factors associated with preterm labor.

<p>Regression analysis of factors associated with preterm labor.</p

Demographic and clinical characteristics of study group as a function of gestational age at delivery: before and after 34 weeks of gestation.

<p>Demographic and clinical characteristics of study group as a function of gestational age at delivery: before and after 34 weeks of gestation.</p

Demographic and clinical characteristics of study group as a function of gestational age at delivery: term vs. preterm.

<p>Demographic and clinical characteristics of study group as a function of gestational age at delivery: term vs. preterm.</p

Comparison of physical activity in pregnant women delivered before and after 37 weeks of gestation.

<p>Comparison of physical activity in pregnant women delivered before and after 37 weeks of gestation.</p

Joint distribution of p21 and hif1α in the study population.

<p>No expression (−), Positive (+).</p

Association between hypertension, proteinuria, abnormal fetoplacental Doppler and IUGR with the expressions of the different genes in the maternal plasma.

<p>For p21, hif1α, VEGF and mdm2, logistic regression statistic was used.</p>*<p>For ERCC, Fisher's test was used. Significant results (p<0.05) in bold.</p

Gene's expression in the maternal plasma of twin pregnancies.

<p>Fisher's exact test for the expression of the different genes in hypoxia versus normal twin pregnancies. No expression (−), positive expression (+).</p

Prevalence of mRNA expressions in normal and hypoxic pregnancies.

<p>The number of cases (n) and percentage of cases (%) in each group with no expression (−) and positive expression (+). χ² tests are shown, significant results (p<0.05). NS, not significant.</p

Relation of clinical data to genes expression in the presence or absence of hypoxia.

<p>Average of each parameter in the study groups is shown. p-values determined by the bootstrap are marked by the letter a.</p