What question did this study set out to answer?

To evaluate the frequency of twin births and assess how rates differ by maternal age and parity.

January 1, 1967American Journal of Epidemiology

Frequency of Twinning in California1

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Authors

PSPaul W. ShipleyBirkbeck, University of London JWJo Ann Wray HHH. H. HechterCalifornia Department of Public Health

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Implication

Epidemiological analysis observes twinning frequency variations across maternal age and parity in California mothers, indicating reproductive influences on multiple births.

Key Points

To evaluate the frequency of twin births and assess how rates differ by maternal age and parity.
Examined population birth records to measure the rate of twin deliveries.
Assessed distribution of multiple births stratified by maternal age categories and parity levels.
Twinning rates demonstrated positive associations with increasing maternal age.
Frequency of multiple births varied significantly according to maternal parity.

Cite This Study

Shipley et al. (1967) studied this question.

synapsesocial.com/papers/6aaa2b627bc880e2eaf6aaa1 https://doi.org/10.1093/oxfordjournals.aje.a120671

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Implication

Epidemiological analysis observes twinning frequency variations across maternal age and parity in California mothers, indicating reproductive influences on multiple births.

Frequency of Twinning in California1

Discussion

Member takes

Implication

Key Points

Cite This Study

Frequency of Twinning in California1

Discussion

Member takes

Implication

Key Points

Cite This Study

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