Family effects on the digit ratio (2D:4D): The role of the interbirth interval
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216224%3A14310%2F19%3A00107449" target="_blank" >RIV/00216224:14310/19:00107449 - isvavai.cz</a>
Result on the web
<a href="https://doi.org/10.1002/ajhb.23260" target="_blank" >https://doi.org/10.1002/ajhb.23260</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1002/ajhb.23260" target="_blank" >10.1002/ajhb.23260</a>
Alternative languages
Result language
angličtina
Original language name
Family effects on the digit ratio (2D:4D): The role of the interbirth interval
Original language description
Objectives Family represents the closest social environment that immediately affects human ontogeny from an early prenatal period. This study aimed to assess sibship influences on the second-to-fourth digit length ratio (2D:4D ratio). Methods The source sample represented 329 children aged 6.5 to 15.8 years (Czech Republic), including a subsample of 75 sibling pairs. A combination of (a) between-family design (cross-sectional sample) and (b) within-family design (pairs of siblings) was used to study the effect of family variables and interbirth interval (IBI) on the 2D:4D ratio. Results Birth order, number of siblings (except for younger sisters), and sex ratio in siblings were significantly related to the 2D:4D ratio on the right, left, or both hands. At the same time, the relationships were opposite in males and females for birth order, number of older brothers and number of children in the family-increasing values in these variables increased digit ratio in males but decreased digit ratio in females. Mean difference in 2D:4D ratio (DIFF) within pairs (older minus younger sibling) differed from zero only in the “older sister-younger brother” group, where DIFF did not depend on IBI. On the contrary, in remaining pair types the DIFF tended to change with IBI, the strongest in the “older brother-younger sister” pairs. Conclusions Family variables, especially number of older brothers, should be considered as important confounding factors in 2D:4D ratio studies. However, the effect of these variables might be modified by IBI.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10700 - Other natural sciences
Result continuities
Project
<a href="/en/project/GP305%2F05%2FP303" target="_blank" >GP305/05/P303: Sexual dimorphism and genetic background of human hand shape</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Others
Publication year
2019
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
American Journal of Human Biology
ISSN
1042-0533
e-ISSN
1520-6300
Volume of the periodical
31
Issue of the periodical within the volume
4
Country of publishing house
US - UNITED STATES
Number of pages
19
Pages from-to
1-19
UT code for WoS article
000474705000011
EID of the result in the Scopus database
2-s2.0-85067350342