Retrospective Studies of the Twinning Rate in Scandinavia

Eriksson, Anna; Eskola, Merja; Fellman, Johan

doi:10.1017/s112096230002240x

Cited by 20 publications

(14 citation statements)

References 16 publications

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“…These factors vary greatly between populations and also over time. 1,3,4 However, none of the main factors can be considered to be autocorrelated.…”

Section: Generalmentioning

confidence: 99%

“…These factors vary greatly between populations and over time. 1,2,3,4 In general, these factors should be considered in every study of twinning. Even if they do not markedly influence the pattern of seasonal variation they may influence the extent of seasonal variation when comparisons are made between different populations or of the same population at different times.…”

Section: Introductionmentioning

confidence: 99%

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Statistical analysis of the seasonal variation in the twinning rate

Fellman¹,

Eriksson

1999

Twin res.

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There have been few secular analyses of the seasonal variation in human twinning and the results are conflicting. One reason for this is that the seasonal pattern of twinning varies in different populations and at different periods. Another reason is that the statistical methods used are different. The changing pattern of seasonal variation in twinning rates and total maternities in Denmark was traced for three periods (1855–69, 1870–94, and 1937–84). Two alternative methods of analysis are considered. The method of Walter and Elwood and a trigonometric regression model give closely similar results. The seasonal distribution of twin maternities for the periods in the 19th century showed highly significant departures. For both twin and general maternities, the main peaks can be seen from March to June and a local peak in September. During the spring– summer season the twinning rates were higher than the total birth rates, indicating a stronger seasonal variation for the twin maternities than for the general maternities. For 1937–84, there was a similar, but less accentuated, pattern. Studies of other populations are compared with the Danish results. The more accentuated seasonal variation of twinning in the past indicate that some factors in the past affected women during summer–autumn and around Christmas time, making them more fecund and particularly to be more prone to polyovulation and/or more able to complete a gestation with multiple embryos.

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“…These factors vary greatly between populations and also over time. 1,3,4 However, none of the main factors can be considered to be autocorrelated.…”

Section: Generalmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Statistical analysis of the seasonal variation in the twinning rate

Fellman¹,

Eriksson

1999

Twin res.

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“…Це може бути пов'язано з народністю йоруба, яка населяє Бенін, Нігерію й Того. У країнах же Азії та Латинської Америки народжується мало близнюків -усього 8-10 на 1000 новонароджених [7,8,9,14,15,16,17].…”

Section: результати дослідженняunclassified

The role of twins in the study of caries and their prevalence in the world and Ukraine

Bilynskyi¹,

Kostenko²,

Dobrovolska³

2019

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За останні два десятиліття кількість близнюків збільшилась майже вдвічі і продовжує рости. Особливе місце у вивченні близнюків посідає комплекс досліджень, пов'язаних із впливом спадковості та середовища на розвиток тих чи інших захворювань, у тому числі карієсу. Для вирішення цих питань найбільш доцільним науковим об'єктом прийнято вважати близнюків, які є своєрідною моделлю генетичної тотожності різних індивідів [1]. Мета-проаналізувати літературні джерела про питання виникнення багатоплідної вагітності та визначення поширеності близнюків у світі, Україні та Закарпатській області.

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“…) and more generally its biology was described (Bulmer, 1970;Gedda, 1951;MacGillivray et al, 1975;Parisi, 1990;etc.). Its demography was also documented in various populations, contributing to the understanding of fertility and sterility trends (e.g., Allen & Parisi, 1990;Eriksson et al, 1976;James, 1972;Parisi & Caperna, 1982;etc. ) and the evolution of reproductive strategies (Allen et al, 1992).…”

Section: The Polysemy Of Twinning and Twin Research: A Multiplicity Omentioning

confidence: 99%

Twin Research, and its Multiple Births and Expressions: A Short, Personal Voyage Through its Scope, History,and Organization

Parisi¹

2004

Twin res.

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The notion of twins and twinning involves a multiplicity of meanings and contexts that altogether encompass an unexpectedly wide and significant part of human experience, culture, and endeavor. This cultural polysemy is, to some extent, also an attribute of twin research, which has structured itself around a multiplicity of scientific areas of enquiry, and across time, throughout a multiplicity of births and rebirths, periodically declining and resurging as a phoenix from its ashes. What is proposed is a short voyage through this polysemy and phoenixity of twinning and twin research, and through the structuring process that has accompanied its developments, international scope, and organization. No claim to completeness, but an attempt to dig into personal memory and experience, and share some recollections of the main steps of the process, and particularly the evolution of the journal, the society, the international meetings, and their role in supporting the area's persistence and continuous revivals and adaptations until today.

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Retrospective Studies of the Twinning Rate in Scandinavia

Cited by 20 publications

References 16 publications

Statistical analysis of the seasonal variation in the twinning rate

Statistical analysis of the seasonal variation in the twinning rate

The role of twins in the study of caries and their prevalence in the world and Ukraine

Twin Research, and its Multiple Births and Expressions: A Short, Personal Voyage Through its Scope, History,and Organization

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