State-specific variation in rates of twin births - United States, 1992-1994

Article Abstract:

There appears to be a large variation in the twin birth rate among states. Between 1980 and 1994, the twin birth rate increased from 18.9 per 1,000 births to 24.6 per 1,000 births, a 30% increase. In 1994, the twin birth rate ranged from 19.8 in Idaho and New Mexico to 27.7 in Massachusettes and Connecticut. The Northeast and Mid-Atlantic states had the highest twin birth rates while the West had the lowest rates. Several states provide insurance coverage for fertility treatments, which often cause multiple pregnancy. Twins are more likely to be premature and have low birth weight.

Statistics, Twins

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Contribution of Assisted Reproduction Technology and Ovulation-Inducing Drugs to Triplet and Higher-Order Multiple Births--United States, 1980-1997

Article Abstract:

The number of multiple pregnancies as a percentage of all pregnancies has increased since 1980. This is most likely a result of in vitro fertilization and the use of ovulation-inducing drugs. Both techniques are more likely to result in multiple births than spontaneously conceived pregnancies. Babies born as part of a multiple pregnancy are more likely to be born prematurely and have low birth weights. This in turn is associated with higher rates of infant disability and mortality.

Health aspects, Causes of, Fertilization in vitro, Human, Human fertilization in vitro, Fertility agents, Fertility drugs

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State-Specific Changes in Singleton Preterm Births Among Black and White Women-- United States, 1990 and 1997

Article Abstract:

Between 1990 and 1997, the rate of premature birth among white women increased while the rate among black women decreased. However, black women are still about twice as likely to have a premature birth as white women. Black women may have more risk factors for premature birth or less access to regular prenatal care.

Statistical Data Included, Demographic aspects, Premature birth

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