Table 1.

Distribution of 368 abnormal cases

Abnormalities	Cases, n
Aneuploidy	310
X monosomy	57
21 monosomy	3
22 monosomy	1
16 trisomy	121
21 trisomy	23
13 trisomy	18
18 trisomy	11
22 trisomy	56
XXY	2
X trisomy	2
Trisomy or monosomy involved	16
in two or more chromosomes
Polyploidy	58
Total	368