Table 1.

Prevalence rates of chromosomal abnormalities in different soft marker groups

Ultrasound category	Ultrasound-determined gestational age	Number of fetuses	Chromosomal abnormalities (n (%))	Aneuploidies	CNVs	Translocations
Increased NT	First-trimester	294	27(9.18)	20	4	3
Absent nasal bone	First-trimester	70	9(12.86)	8	1	0
Single umbilical artery	First-trimester	12	0(0.00)	0	0	0
Choroid plexus cyst	Second-trimester	48	3(6.25)	1	2	0
Short femur	Second-trimester	26	1(3.85)	1	0	0
Mild ventriculomegaly	Second-trimester	25	0(0.00)	0	0	0
Tricuspid regurgitation	Second-trimester	19	2(10.53)	0	2	0
Aberrant right subclavian artery	Second-trimester	19	1(5.26)	0	0	1
Echogenic bowel	Second-trimester	12	0(0.00)	0	0	0
Echogenic intracardiac focus	Second-trimester	5	3(60.00)	3	0	0
Other	-	15	0(0.00)	0	0	0
Multiple Soft Markers	-	77	25(32.47)	24	0	1
Total	-	622	71(11.41)	57	9	5