Published in Medical Letter on the CDC and FDA, July 2nd, 2006
According to researchers in the United States, "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. We used natality file data from 1980 through 2000 to assess very-low-birthweight and low-birthweight rates among singleton live-born infants. 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...
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