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© 1991 Oxford University Press

research-article

Another Look at the Black-White Gap in Gestation-Specific Perinatal Mortality

MELISSA M ADAMS*, CYNTHIA J BERG**,, PHILIP H RHODES{dagger} and BRIAN J MCCARTHY*

*Division of Reproductive Health, National Center for Chronic Disease Prevention and Health Promotion, Centers for Disease Control Atlanta, GA 30333, USA.
**Division of Birth Defects and Developmental Disabilities, Center for Environmental Health and Injury Control, Centers for Disease Control Atlanta, GA 30333, USA.
{dagger}Division of Immunizations, Center for Prevention Services, Centers for Disease Control Atlanta, GA 30333, USA.

Reprint Requests to: Cynthia Berg

In the US, black infants born near or at term experience higher mortality than white infants. To extend our understanding of black-white differences in the relative advantages of growth (measured by birthweight) for gestational age, we compared race-specific rates of perinatal mortality by deviation in grams from the median birthweight for four categories of gestation (35–36, 37–38, 39–41, and 42–43 weeks). We also used race-specific standards to examine the difference between the median birthweight and the optinum birthweight {i.e. birthweight with the lowest mortality}. The data, which were derived from vital records for singletons delivered in the US from 1983–1984, comprised 24626 total and neonatal deaths among 5157197 white infants and 5973 fetal and neonatal deaths among 926678 black infants. At all deviations from the median birthweight, black infants had relatively better survival at 35–36 weeks of gestation. This advantage was reversed among infants with gestations of 39–41 and 42–43 weeks. The optimum birthweight for black infants with gestations ≥37 weeks was closer to their median birthweight than was that for white infants. For black infants with gestations of 39–41 weeks, the optimum birthweight was 187g (95% confidence interval (CI): 150–234) greater than the median birthweight (3289g); for comparable white infants the optimum birthweight was 397g (95% CI: 366–431) greater than the median birthweight (3487g). To reduce the black-white gap in perinatal mortality, we need a better understanding of aetiological of relations between gestation, growth, and mortality.

Revised 1 April 1991


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