Titre :
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Environmental factors, reproductive history, and selective fertility in farmers sibships. (1997)
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Auteurs :
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P. KRISTENSEN ;
T. BJERKEDAL ;
L.M. IRGENS
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Type de document :
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Article
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Dans :
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American journal of epidemiology (vol. 145, n° 9, 1997)
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Pagination :
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817-825
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Langues:
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Anglais
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Mots-clés :
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Fécondabilité
;
Epidémiologie
;
Agriculture
;
Femme
;
Homme
;
Gestation [pathologie]
;
Mortalité
;
Foetopathie
;
Reproduction
;
Norvège
;
Europe
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Résumé :
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[BDSP. Notice produite par INIST 7R0xW6xG. Diffusion soumise à autorisation]. In a national study of births to farmers in Norway, grain farming was associated with short gestational age (21-24 weeks). An impact of selective fertility and maternal heterogeneity on the association was suspected but could not be assessed further in a traditional birth-based design. Thus, analyses based on the mother as the observational unit were performed. A total of 45,969 farmers with a first birth in 1967-1981 were followed for subsequent births and perinatal mortality. A perinatal loss increased farmers'likelihood to continue to another pregnancy, but this selective fertility was less dominant than in the general population due to a higher baseline fertility. The effect of the mother's reproductive history on the grain farming-midpregnancy delivery association was analyzed in 59,338 farmers with more than one single birth in 1967-1991. A history of preterm birth (
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