Document Detail

Trends in birth across high-parity groups by race/ethnicity and maternal age.
MedLine Citation:
PMID:  16035578     Owner:  NLM     Status:  MEDLINE    
BACKGROUND: The changing racial and ethnic diversity of the U.S. population along with delayed childbearing suggest that shifts in the demographic composition of gravidas are likely. It is unclear whether trends in the proportion of births to parous women in the United States have changed over the decades by race and ethnicity, reflecting parallel changes in population demographics. METHODS: Singleton deliveries > or = 20 weeks of gestation in the United States from 1989 through 2000 were analyzed using data from the "Natality data files" assembled by the National Center for Health Statistics (NCHS). We classified maternal age into three categories; younger mothers (aged < 30 years), mature mothers (30-39 years) and older mothers (> or = 40 years) and maternal race/ethnicity into three groups: blacks (non-Hispanic), Hispanics and whites (non-Hispanic). We computed birth rates by period of delivery across the entire population and repeated the analysis stratified by age and maternal race. Chi-squared statistics for linear trend were utilized to assess linear trend across three four-year phases: 1989-1992, 1993-1996 and 1997-2000. In estimating the association between race/ethnicity and parity status, the direct method of standardization was employed to adjust for maternal age. RESULTS: Over the study period, the total number of births to blacks and whites diminished consistently (p for trend < 0.001), whereas among Hispanics a progressive increase in the total number of deliveries was evident (p for trend < 0.001). Black and white women experienced a reduction in total deliveries equivalent to 10% and 9.3%, respectively, while Hispanic women showed a substantial increment in total births (25%). Regardless of race or ethnicity, birth rate was associated with increase in maternal age in a dose-effect fashion among the high (5-9 previous live births), very high (10-14 previous live births) and extremely high (> or = 15 previous live births) parity groups (p for trend < 0.001). After maternal age standardization, black and Hispanic women were more likely to have higher parity as compared to whites. CONCLUSIONS: Our findings demonstrate substantial variation in parity patterns among the main racial and ethnic populations in the United States. These results may help in formulating strategies that will serve as templates for optimizing resource allocation across the different racial/ethnic subpopulations in the United States.
Muktar H Aliyu; Hamisu M Salihu; Louis G Keith; John E Ehiri; M Aminul Islam; Pauline E Jolly
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of the National Medical Association     Volume:  97     ISSN:  0027-9684     ISO Abbreviation:  J Natl Med Assoc     Publication Date:  2005 Jun 
Date Detail:
Created Date:  2005-07-22     Completed Date:  2005-09-02     Revised Date:  2009-11-18    
Medline Journal Info:
Nlm Unique ID:  7503090     Medline TA:  J Natl Med Assoc     Country:  United States    
Other Details:
Languages:  eng     Pagination:  799-804     Citation Subset:  IM    
Department of Epidemiology, University of Alabama at Birmingham, CHSB 19 Rm 403/ Box 3, 933 19th St. S., Birmingham, AL 35294-2041, USA.
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MeSH Terms
African Continental Ancestry Group / statistics & numerical data
Birth Rate / trends*
European Continental Ancestry Group / statistics & numerical data
Hispanic Americans / statistics & numerical data
Infant, Newborn
Maternal Age*
United States / epidemiology

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