Open AccessTrends in US sex ratio by plurality, gestational age and race/ethnicity
Author(s) -
Amy M. Branum,
Jennifer D. Parker,
Kenneth C. Schoendorf
Publication year - 2009
Publication title -
human reproduction
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.446
H-Index - 226
eISSN - 1460-2350
pISSN - 0268-1161
DOI - 10.1093/humrep/dep255
Subject(s) - demography , gestational age , ethnic group , sex ratio , population , birth weight , medicine , birth rate , singleton , pregnancy , fertility , biology , genetics , sociology , anthropology
The sex ratio in the USA has declined over recent decades, resulting in fewer male births. Concurrent changes in the childbearing population may have influenced the sex ratio, including increases in multiple births, improvements in perinatal survival and increased Hispanic births.
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