Pregnancy outcome distribution and prenatal diagnosis of autosomal abnormalities, Hawaii, 1986-1999
Article first published online: 18 SEP 2002
Copyright © 2002 Wiley-Liss, Inc.
Volume 66, Issue S1, pages S7–S11, 2002
How to Cite
Forrester, M. B. and Merz, R. D. (2002), Pregnancy outcome distribution and prenatal diagnosis of autosomal abnormalities, Hawaii, 1986-1999. Teratology, 66: S7–S11. doi: 10.1002/tera.90003
- Issue published online: 18 SEP 2002
- Article first published online: 18 SEP 2002
- Hawaii State Department of Health, Children With Special Health Needs Branch
- Centers for Disease Control and Prevention
- March of Dimes Birth Defects Foundation
- George F. Straub Trust
- Queen Emma Foundation
- Pacific Southwest Regional Genetics Network
- Kamehameha Schools/Bishop Estate
Approximately 10% of birth defects result from chromosomal abnormalities. This study investigated the pregnancy outcome distribution of autosomal abnormalities and impact of prenatal diagnosis on autosomal abnormalities.
Data were obtained from a population-based birth defects registry and included all autosomal abnormalities delivered in Hawaii during 1986-1999.
There were 1,015 autosomal abnormality cases, consisting of 523 (52%) live births, 38 (4%) late fetal deaths, 187 (18%) early fetal deaths, 265 (26%) elective terminations, and 2 unknown pregnancy outcome. Live births comprised the majority of translocations (81%), inversions (93%), and deletions (84%) but a smaller proportion of trisomies (42%). Autosomal abnormalities were prenatally diagnosed in 489 (48%) of the cases, of which 243 (50%) were subsequently electively terminated. By type of autosomal abnormality, prenatal diagnosis rates were trisomy (44%), translocation (68%), inversion (91%), deletion (29%), and subsequent elective termination rates were trisomy (73%), translocation (11%), inversion (4%), deletion (50%). The prenatal diagnosis rate was higher for maternal age 35 years or greater than for maternal age less than 35 years (relative risk (RR) 1.8, 95% confidence interval (CI) 1.6-2.0), as was the elective termination rate (RR 1.3, 95% CI 1.1-1.6). The prenatal diagnosis rate was higher in 1993-1999 than in 1986-1992 (RR 1.2, 95% CI 1.1-1.4), although there was no statistically significant difference between the two time periods for subsequent elective termination rate (RR 0.9, 95% CI 0.8-1.1).
Pregnancy outcome distribution, prenatal diagnosis rates, and subsequent elective terminations rates vary by type of autosomal abnormality. Teratology 66:S7–S11, 2002. © 2002 Wiley-Liss, Inc.