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

Table 2

Distribution of the cases of Down syndrome according to maternal age and ultrasound markers.

Maternal age (years)	With markers		Without markers		Statistical analysis (𝑃<0.05)
	Present	Absent	Present	Absent
35	4	46	2	89	𝑃=0.11
36	2	19	1	91	𝑃=0.08
37	2	13	1	112	𝑃=0.03
38	2	9	1	101	𝑃=0.02
39	1	8	1	94	𝑃=0.16
≥40	8	17	6	259	𝑃<0.001
Total	19	112	12	746