Frontomaxillary Facial Angle Measurement in Screening for Trisomy 18 at 11 + 0 to 13 + 6 Weeks of Pregnancy: A Double-Centre Study

Table 1

FMF angle in chromosomally normal and in trisomy 18 fetuses.

	Minimum (°)	Lower quartile (°)	Median (°)	SD	Upper quartile (°)	Maximum (°)	Mann-Whitney 𝑈 test
Normal karyotype	69.0	74.0	77.0	4.6	80.0	103.0	<0.0001
Trisomy 18	83.0	84.0	94.5	6.4	97.0	103.0