Geographic Variation in Fertility Measures in Sweden in (1749-1870).
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Date
2015
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Abstract
We analysed geographic variation in the number of males per 100 females at birth also called the
secondary sex ratio (SR), the crude birth rate (CBR), the total fertility rate (TFR) and the twinning
rate (TWR). Earlier studies have noted geographic variations in the 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. In this study, we analysed historical demographic data and
investigated the geographic variations between the counties in Sweden for the SR among the live
born (1749-1869), the CBR in 1751-1870, the TFR in 1860 and the TWR in 1751-1860. We built
spatial models and as regressors we used geographic co-ordinates for the residences of the
counties in Sweden. The influence of the CBR and TFR on the SR and TWR was examined. For all
variables, we obtained spatial variations, albeit of different patterns and power. Hence, no common
spatial pattern for the demographic variables SR, TFR, CBR and TWR was detected, but a better
fit was noted for TFR, CBR and TWR than for SR.
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Keywords
Counties, crude birth rates, geographic co-ordinates, live births, multicollinearity, secondary sex ratios, spatial models, stepwise regression, twinning rates, total fertility rates
Citation
Fellman Johan, Eriksson Aldur W. Geographic Variation in Fertility Measures in Sweden in (1749-1870). British Journal of Medicine and Medical Research. 2015; 7(1): 1-10.