Table 1.

Demographic and ultrasonographic indices within the study sample

	Mean±SD	Median (IQR)	Minimum–maximum
Maternal age (year)	28±5	27 (24–31)	20–37
NT (mm)	1.30±0.28	1.30 (1.10–1.42)	0.60–2.48
CRL (mm)	57.39±7.26	57 (51–63)	43–80
DVPI	1.06±0.18	1.06 (0.95–1.14)	0.1–1.89
DVRI*	0.77±0.76	0.78 (0.73–0.82)	0.50–0.98
DV S/A ratio*	4.17±1.40	3.90 (3.22–4.79)	1.80–10.18

*Missing data included 16 and 99 cases for DVRI and S/D ratio, respectively. None of the above variables showed normal distribution based on the Shapiro-Wilk test (P<0.05). CRL=Crown-rump length; DV=Ductus venosus; DVPI=DV pulsatility index; DVRI=DV resistance index; IQR=Interquartile range; SD=Standard deviation; NT=Nuchal translucency; S/A=S-wave maximum velocity/A-wave minimum velocity