Table 1.

Detection of fetal aneuploidies in different indications

Indications	Detected number	Positive number	Positive rate (%)
Advanced maternal age	9516	124	1.30
With high risk	1118	21	1.88
With low risk	8398	103	1.23
Normal maternal age	27397	247	0.90
With high risk	12575	145	1.15
With low risk	14822	102	0.69
Total	36913	371	1.01