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Demographic components of seasonality of pregnancy

Published online by Cambridge University Press:  31 July 2008

Jeffrey E. Kallan  and
J. Richard Udry
Jeffrey E. Kallan
Affiliation:
Center for Demography and Ecology, University of Wisconsin, Madison
J. Richard Udry
Affiliation:
Carolina Population Center, University of North Carolina, Chapel Hill, USA
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Summary

Previous studies of the seasonality of pregnancy and birth have typically been based on monthly numbers or proportions of pregnancies or births (i.e. their distribution throughout the year) without any explicit accounting of the size of the population actually at risk of pregnancy by month. From data on monthly populations at risk and monthly probabilities of pregnancy this paper determines the relative contribution of each component to the monthly distribution of pregnancies. The data come from the National Survey of Family Growth, Cycle III. While there is some seasonality in the size of the at-risk population, it contributes little to the overall monthly variation of pregnancy, which is determined mainly by seasonality of pregnancy probability (fecundability).

Type
Research Article
Information
Journal of Biosocial Science , Volume 21 , Issue 1 , January 1989 , pp. 101 - 108
Copyright
Copyright © Cambridge University Press 1989

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References

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