. 2015 Mar 8;32(5):827–837. doi: 10.1007/s10815-015-0429-y

Table 1.

Clinical characteristics of the study population

Characteristics	Pregnant women carrying trisomy 21fetuses	Pregnant women carrying euploid fetuses	Non pregnant women	P value
Characteristics	(n = 4)	(n = 5)	(n = 2)	P value
At blood sampling
Age (years)	32.0	35.0	29.0	0.185^a
Age (years)	(30.0–35.5)	(32.0–37.0)	(28.0–30.0)	0.185^a
Body mass index (kg/m²)	21.3	21.0	21.5	0.492^a
Body mass index (kg/m²)	(19.3–24.0)	(20.6–21.4)	(21.0–22.0)	0.492^a
Gestational age (weeks)	12.5	12.5	–	0.902^b
Gestational age (weeks)	(11.9–12.9)	(11.3–13.0)	–	0.902^b
Gravidity (n)	2.5	3.0		0.905^b
Gravidity (n)	(1.5–4.5)	(2.0–4.0)		0.905^b
Nullipara (%)	25	20		0.858
Gender-ratio of fetus (male:female)	2:2	3:2	–	0.764

Values are medians with interquartile range in parentheses

^aKruskal-Wallis test

^bMann-Whitney U test