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

Table 6

Odds ratios between the number of ultrasound markers and Down syndrome.

Number of markers	Down syndrome				Odds ratio	Confidence interval (95%)
	Present		Absent
0	12	38.7	746	86.9	0.1	0.0–0.2
1	14	45.2	89	10.4	10.5	4.1–23.4
≥2	5	16.1	23	2.7	13.5	3.8–46.2