Influence of Second-Trimester Ultrasound Markers for Down Syndrome in Pregnant Women of Advanced Maternal Age

Table 1

Description of the cases of Down syndrome according to the groups with and without ultrasound markers (𝑃<0.001).

Group of pregnant women	Down syndrome
	Present		Absent		Total
With markers	19	14.6%	112	85.5%	131	100.0%
Without markers	12	1.6%	746	98.4%	758	100.0%
Total	31	3.5%	858	96.5%	889	100.0%