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U.S. Regional Changes in Twinning Rates

Published online by Cambridge University Press:  01 August 2014

Gordon Allen
Gordon Allen*
Affiliation:
U.S. Public Health Service, Retired
*
9326 West Parkhill Dr., Bethesda MD 20814, USA

Abstract

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The rise in twinning rates previously reported for U.S. between 1964 and 1987 after adjustment for maternal age and birth order occurred in each of the nine conventional geographic divisions except the Pacific States. Differences and consistencies in rank order among the divisions with respect to crude and adjusted twinning rates and other demographic parameters may hold clues to yet unidentified influences in twinning.

Keywords

Twinning ratesTemporal variationGeographic variation
Type
Research Article
Information
Acta geneticae medicae et gemellologiae: twin research , Volume 37 , Issue 3-4 , October 1988 , pp. 307 - 311
Copyright
Copyright © The International Society for Twin Studies 1988

References

REFERENCES

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