Document Detail

Temporal, seasonal, and regional differences in births and deaths in Aland (Finland).
MedLine Citation:
PMID:  18720899     Owner:  NLM     Status:  MEDLINE    
A good knowledge of the seasonal variation during normal years is of fundamental importance for analyses of the effects of wars, famines, epidemics, or similar privations on births and deaths. In this study we consider data from the Aland Islands (Finland) for 1650-1950. During the period 1650-1793 there are subperiods with missing data for all parishes, and consequently the total data for the Aland Islands for this period have to be estimated using available data. For the period 1794-1950 the registered data seem to be complete and reliable, but the war year 1809 shows a marked deficit of births. During the last decades of the 19th century the number of births increases markedly and after that shows a strong decrease. After the 1930s births increase again. To allow seasonality comparisons between the Aland Islands as a whole and its subregions, we base our studies on seasonal indexes. There is a markedly decreasing temporal trend in the seasonal variation of births for the Aland Islands as a whole, but the general pattern remains mainly the same, having two peaks, one in March-April and one in September-October. For the period 1901-1950 the seasonal variation almost disappeared. The strength of the seasonal variation in births shows regional differences, but the general pattern is mainly the same. The outermost parish, Kökar, an isolate of its own, shows the strongest seasonal variation in births. The annual number of deaths shows some marked peaks, especially in the war year 1809. For both sexes there are marked peaks in 1809, indicating that the deaths were mainly caused by epidemic diseases rather than by killing in battles. For mortality a decreasing trend in the seasonal variation is observed during 1650-1750, but after 1751-1800 the strength of seasonality shows an increasing trend and a sinusoidal pattern.
Aldur W Eriksson; Johan Fellman; Lynn B Jorde; Kari Pitkänen
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Publication Detail:
Type:  Comparative Study; Historical Article; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Human biology     Volume:  80     ISSN:  0018-7143     ISO Abbreviation:  Hum. Biol.     Publication Date:  2008 Apr 
Date Detail:
Created Date:  2008-08-25     Completed Date:  2008-10-22     Revised Date:  2011-04-18    
Medline Journal Info:
Nlm Unique ID:  0116717     Medline TA:  Hum Biol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  125-40     Citation Subset:  IM    
Folkhälsan Institute of Genetics, Population Genetics Unit, Helsinki, Finland.
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MeSH Terms
Birth Rate / trends*
History, 17th Century
History, 18th Century
History, 19th Century
History, 20th Century
Mortality / history*,  trends
Population Dynamics*
Time Factors

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