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cyclic variation

Acta geneticae medicae et gemellologiae: twin research (1)

International Soc for Twin Studies (1)

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Investigation on Seasonality of Twin Births in Brazil
H. Krieger, G. M. D. D. Colletto, C. Franchi-Pinto, B. Beiguelman
Journal:

Acta geneticae medicae et gemellologiae: twin research / Volume 45 / Issue 4 / October 1996

Published online by Cambridge University Press:

01 August 2014, pp. 397-403

Print publication:

October 1996
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The hypothesis of seasonality of twin births was investigated in two important maternity hospitals in the State of Sāo Paulo, Brazil. The study included 1,386 twin births that occurred among 154,699 deliveries from 1984 to 1993. No evidence of seasonality has been detected either for the twin birth rate considered as a whole or for dizygotic twinning rate. The distributions of these rates fitted well sinusoidal regression curves but the cyclic trend did not correspond to any specific season.