Changes in twinning rate: Italy 1950-1996 | Zendy

Paola Astolfi | Zendy; Laura Ulizzi | Zendy; L. Zonta | Zendy

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Changes in twinning rate: Italy 1950-1996

Author(s) -

Paola Astolfi,

Laura Ulizzi,

L. Zonta

Publication year - 2003

Publication title -

human reproduction

Language(s) - Uncategorized

Resource type - Journals

SCImago Journal Rank - 2.446

H-Index - 226

eISSN - 1460-2350

pISSN - 0268-1161

DOI - 10.1093/humrep/deg036

Subject(s) - crystal twinning , fertility , population , total fertility rate , demography , birth rate , reproduction , natural fertility , biology , family planning , research methodology , ecology , materials science , sociology , microstructure , metallurgy

In the wide-ranging debate about the potential monitors of population fertility, twinning rate has been considered a candidate. In the developed countries, a decline in spontaneous twinning rate began around 1950 and continued until the late 1970s. The decrease in mean maternal age at delivery and the number of children per family have been considered as possible reasons for the decrease. The rise in twinning rates, which began in the 1980s, is probably due to the spread of assisted reproduction, at least for older mothers.

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