Table 2.

Types of ultrasonic structure and CNV.

Types of ultrasonic structure	Total cases	Abnormal number of CNV	Percentage of abnormal CNV (%)	Number of pCNV	Number of VUS
Skeletal system	95	13	13.7	11	2
Nervous system	170	23	13.5	19	4
Urinary system	268	34	12.7	30	4
Facial abnormality	74	8	10.8	4	4
Respiratory system	55	5	9.1	4	1
Cardiovascular system	807	73	9.0	61	12
Digestive system	87	7	8.0	6	1
Multiple system	252	63	25.0	57	6

Abbreviations: pCNV pathogenic copy number variation, VUS variants of unknown significance.