Effect of fertility on secondary sex ratio and twinning rate in Sweden, 1749-1870

Johan Fellman; Aldur Eriksson

doi:10.1017/thg.2014.71

Effect of fertility on secondary sex ratio and twinning rate in Sweden, 1749-1870

Johan Fellman, Aldur Eriksson

Ekonomisk statistik, Helsingfors

Folkhälsan Institute of Genetics

Forskningsoutput: Tidskriftsbidrag › Artikel › Vetenskaplig › Peer review

1 Citeringar (Scopus)

Sammanfattning

We analyzed the effect of total fertility rate (TFR) and crude birth rate (CBR) on the number ofmales per 100 females at birth, also called the secondary sex ratio (SR), and on the twinning rate (TWR). Earlier studies have noted regional variations in TWR and racial differences in the SR. Statistical analyses have shown
that comparisons between SRs demand large data sets because random fluctuations in moderate data are marked. Consequently, reliable results presuppose national birth data. Here, we analyzed historical demographic data and their regional variations between counties in Sweden. We built spatial models for the TFR in 1860 and the CBR in 1751–1870, and as regressors we used geographical coordinates for the provincial capitals of the counties. For both variables, we obtained significant spatial variations, albeit of different patterns and power. The SR among the live-born in 1749–1869 and the TWR in 1751–1860 showed slight spatial variations. The influence of CBR and TFR on the SR and TWR was examined and statistical significant effects were found.

Originalspråk	Engelska
Referentgranskad vetenskaplig tidskrift	Twin Research and Human Genetics
Volym	18
Nummer	1
Sidor (från-till)	92-99
Antal sidor	8
ISSN	1832-4274
DOI	https://doi.org/10.1017/thg.2014.71
Status	Publicerad - 12.2014
MoE-publikationstyp	A1 Originalartikel i en vetenskaplig tidskrift

Nyckelord

112 Statistik
512 Företagsekonomi

Åtkomst av dokument

10.1017/thg.2014.71

OpenUrl-tillgänglighet

Fulltext

Citera det här

@article{6583218aa24f4bbe80cc94c29f786f1a,

title = "Effect of fertility on secondary sex ratio and twinning rate in Sweden, 1749-1870",

abstract = "In earlier studies, scientists have attempted to identify genetic and environmental factors affecting the rate of multiple maternities among humans. We contribute to these studies by analyzing the frequencies of multiple maternities in sibships containing triplets. Use of the Hellin transformation is included in evaluationof the triplet rate. Our results indicate greater frequencies of repeated multiple maternities in the sibships than expected, based on population frequencies. The excesses obtained are more marked in triplet maternities than in twin maternities. The transformed triplet rate shows results similar to the twinning rate. The findings also indicate that in families, the influence of maternal factors on the frequencies of multiple maternities is stronger than the influence of paternal factors.",

keywords = "112 Statistics and probability, 512 Business and Management",

author = "Johan Fellman and Aldur Eriksson",

year = "2014",

month = dec,

doi = "10.1017/thg.2014.71",

language = "English",

volume = "18",

pages = "92--99",

journal = "Twin Research and Human Genetics",

issn = "1832-4274",

publisher = "Australian Academic Press Pty. Ltd",

number = "1",

}

TY - JOUR

T1 - Effect of fertility on secondary sex ratio and twinning rate in Sweden, 1749-1870

AU - Fellman, Johan

AU - Eriksson, Aldur

PY - 2014/12

Y1 - 2014/12

N2 - In earlier studies, scientists have attempted to identify genetic and environmental factors affecting the rate of multiple maternities among humans. We contribute to these studies by analyzing the frequencies of multiple maternities in sibships containing triplets. Use of the Hellin transformation is included in evaluationof the triplet rate. Our results indicate greater frequencies of repeated multiple maternities in the sibships than expected, based on population frequencies. The excesses obtained are more marked in triplet maternities than in twin maternities. The transformed triplet rate shows results similar to the twinning rate. The findings also indicate that in families, the influence of maternal factors on the frequencies of multiple maternities is stronger than the influence of paternal factors.

AB - In earlier studies, scientists have attempted to identify genetic and environmental factors affecting the rate of multiple maternities among humans. We contribute to these studies by analyzing the frequencies of multiple maternities in sibships containing triplets. Use of the Hellin transformation is included in evaluationof the triplet rate. Our results indicate greater frequencies of repeated multiple maternities in the sibships than expected, based on population frequencies. The excesses obtained are more marked in triplet maternities than in twin maternities. The transformed triplet rate shows results similar to the twinning rate. The findings also indicate that in families, the influence of maternal factors on the frequencies of multiple maternities is stronger than the influence of paternal factors.

KW - 112 Statistics and probability

KW - 512 Business and Management

U2 - 10.1017/thg.2014.71

DO - 10.1017/thg.2014.71

M3 - Article

SN - 1832-4274

VL - 18

SP - 92

EP - 99

JO - Twin Research and Human Genetics

JF - Twin Research and Human Genetics

IS - 1

ER -

Effect of fertility on secondary sex ratio and twinning rate in Sweden, 1749-1870

Sammanfattning

Nyckelord

Åtkomst av dokument

OpenUrl-tillgänglighet

Fingeravtryck

Citera det här