Table 2.

Most frequent copy number changes observed in fetuses without structural anomalies.

Without Fetal Anomalies
CNV Region	Frequencyb (Deletion + Duplication)
15q11.2	5.8%
Xp22.3	7.7%
Xp21.1	7.7%
16p11.2	7.7%
1q21.1	9.6%
17p12	9.6%
16p13.11	13.5%
22q11.21	15.4%
Single Occurrence	23.1%

^bData from Fiorentino et al (60), Shaffer et al (26), Armengol et al (59), Lee et al (61), Wapner et al (2)