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.
Department of Epidemiology, University of Alabama at Birmingham, CHSB 19 Rm 403/ Box 3, 933 19th St. S., Birmingham, AL 35294-2041, USA. mhaliyu@uab.edu
