The background and cotinine levels in the study group.

There were no significant differences in the maternal age, gestational age, systolic blood pressure, diastolic blood pressure and crown-rump length between the non-smokers and the active smokers. The data are presented as medians and quartiles. ap values are based on Wilcoxon rank-sum test. bp values were obtained by Fisher’s exact test. The background and cotinine levels in the study group.