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Titolo:
Demographic and behavioral determinants of the reduction of male-to-femalebirth ratio in Spain from 1981 to 1997
Autore:
Gutierrez-Adan, A; Pintado, B; De la Fuente, J;
Indirizzi:
INIA, Dept Reprod Anim & Conservac Recursos Zoogenet, Madrid, Spain INIA Madrid Spain rod Anim & Conservac Recursos Zoogenet, Madrid, Spain
Titolo Testata:
HUMAN BIOLOGY
fascicolo: 5, volume: 72, anno: 2000,
pagine: 891 - 898
SICI:
0018-7143(200010)72:5<891:DABDOT>2.0.ZU;2-S
Fonte:
ISI
Lingua:
ENG
Soggetto:
PARENTAL AGE GAP; SEX-RATIO; MALE/FEMALE RATIO; NEWBORN-INFANTS; UNITED-STATES; CYCLE; INSEMINATION; SELECTION; ENGLAND; WALES;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
28
Recensione:
Indirizzi per estratti:
Indirizzo: Gutierrez-Adan, A INIA, Dept Reprod Anim & Conservac Recursos Zoogenet, Ctra La Coruna Km 5-9, Madrid, Spain INIA Ctra La Coruna Km 5-9 Madrid Spain Madrid, Spain
Citazione:
A. Gutierrez-Adan et al., "Demographic and behavioral determinants of the reduction of male-to-femalebirth ratio in Spain from 1981 to 1997", HUMAN BIOL, 72(5), 2000, pp. 891-898

Abstract

The ratio of male-to-female births has been declining in Spain since 1981. In the last few decades, the proportion of male newborns has also been decreasing in other industrialized countries. It has been hypothesized that these declines are due to environmental factors such as a longer exposure to environmental pollutants, hormonal levels, or sexual behavior. The objective of this study was to examine the evidence of decline in the male proportion of births in Spain and to correlate it to demographic causes (mother's age, marriage age, and age difference between husband and wife). The analysis was based on birth records in Spain from 1945 to 1997. The data show a significant correlation (p < 0.01) between the reduction in the ratio of male-to-female births observed and two variables, the variations in mean age atmarriage and the older age at which women give birth. More women are delaying childbearing until their thirties and, as a consequence, there has beena decrease in the proportion of male newborns.

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Documento generato il 21/09/20 alle ore 06:03:01