Skip to main content
. Author manuscript; available in PMC: 2013 May 6.
Published in final edited form as: J Pediatr. 2011 Dec 16;160(5):774–780.e11. doi: 10.1016/j.jpeds.2011.11.005

TABLE 1.

Frequency and distribution of major types of chromosomal anomalies among VLBW infants in the Vermont Oxford Network born 1994–2009

Type of Chromosomal Anomaly Including Infants with Other
Chromosomal Anomalies
N (%)1 		Excluding Infants with Other
Chromosomal Anomalies
N (%)2
Trisomy 21 1690 (0.31) 1681 (0.31)
Trisomy 18 1430 (0.27) 1416 (0.26)
Trisomy 13 443 (0.08) 435 (0.08)
Triploidy 116 (0.02) 116 (0.02)
1

7 infants had T21 and other chromosomal anomaly including: 2 with triple X syndrome, 3 with Klinefelter’s syndrome, 1 with DiGeorge syndrome and 1 with 3p deletion; 2 infants had T21 and T18; 7 infants had T18 and other chromosomal anomaly including: 3 with triple X syndrome, 1 with Klinefelter’s syndrome, 1 with trisomy 6, 1 with Wolf-Hirschhorn syndrome and 1 with partial trisomy 20q and partial monosomy 20p; 5 infants had T18 and T13; 3 infants had T13 and other chromosomal anomaly including: 1 with triple X syndrome, 1 with DiGeorge syndrome, and 1 with ring chromosome 15.

2

Numbers exclude infants with associated chromosomal anomalies. Numbers include mosaic cases: 2 infants with T21, 5 with T18, 1 with T13, 1 with triploidy/diploidy.