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Am J Public Health. 2006 May;96(5):856-61. Epub 2006 Mar 29.

Associations of maternal age- and parity-related factors with trends in low-birthweight rates: United States, 1980 through 2000.

Author information

1
Division of Birth Defects and Developmental Disabilities, National Center on Birth Defects and Developmental Disabilities, Centers for Disease Control and Prevention, 1600 Clifton Rd, Mail Stop E-86, Atlanta, GA 30333, USA. qay0@cdc.gov

Abstract

OBJECTIVES:

We assessed the effects of changes in the maternal age-parity distribution and age-and parity-specific low-birthweight rates on low-birthweight trends in the United States.

METHODS:

We used natality file data from 1980 through 2000 to assess very-low-birthweight and low-birthweight rates among singleton live-born infants.

RESULTS:

Changes in age-and parity-specific low-birthweight rates were the main contributor to the overall trend in rates. However, changes in the age-parity distribution, primarily delayed childbearing, had a smaller but noticeable impact. The very-low-birthweight rate increased 27% among Black women, and changes in the age-parity distribution were associated with, on average, more than 20% of the increased rate during the 1990s. Among Hispanic and non-Hispanic White women, on average, more than 10% of the rate increase observed during the 1990s was associated with changes in the age-parity distribution.

CONCLUSIONS:

Assuming minimal changes in age-specific rates, delayed childbearing may play an increasingly important role in low-birthweight trends in the United States.

Comment in

PMID:
16571716
PMCID:
PMC1470574
DOI:
10.2105/AJPH.2004.049312
[Indexed for MEDLINE]
Free PMC Article
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