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Twins With Feingold Syndrome: Overview and Interview/Twin Research Summaries: Pseudoamonoamniotic Twins; Selective Fetal Growth Restriction in Monoamniotic Twins; Twin Authorship Attribution; Twins Discordant for Clubfoot/Human Interest: Twins with Different Fathers; Biological Relatedness in a Married Couple; Birth of Identical Quadruplets; Twins Switching Places.

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Trends in Birth Rates, Sex Ratio, and Infant Mortality Rates Among Singletons, Twins, and Higher Order Multiples in Brazil Between 2010 and 2023.

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Brazilian Twin Studies: A Scoping Review.

Eloisa de Souza Fernandes1, Isabella França Ferreira1, Renata Pereira de Felipe1

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Summary

Brazilian twin research is growing, with most studies in health and psychology. This trend shows increasing scientific interest and potential global impact.

Keywords:
Behavior GeneticsHeritabilityScoping reviewTwin

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Area of Science:

  • Brazilian twin research spans multiple scientific domains.
  • Health sciences, particularly medicine, dominate the publication landscape.
  • Psychology, odontology, and biology are also significant areas of study.

Background:

  • Brazilian twin research is internationally underrepresented.
  • There is a need to comprehensively understand and categorize existing studies.
  • Previous meta-analyses may have overlooked Brazilian contributions.

Purpose of the Study:

  • To conduct a comprehensive investigation of Brazilian twin research across different fields.
  • To assess the representation of psychological research within the broader twin studies.
  • To identify characteristics of Brazilian twin research that might explain its exclusion from global meta-analyses.

Main Methods:

  • A scoping review was conducted following PRISMA guidelines.
  • Six databases (CAPES, BDLTD, PePSIC, PubMed, Google Scholar, SciELO) were searched up to 2022.
  • Keywords related to twins and Brazil were used in Portuguese and English.

Main Results:

  • 340 publications were included in the review.
  • Approximately 53.8% utilized the classic twin design for heritability studies.
  • Publication numbers have doubled roughly every decade, indicating growth.
  • Health sciences, led by medicine (approx. 50%), followed by psychology, odontology, and biology, constitute the majority of studies.

Conclusions:

  • Brazilian scientists' interest in twin research is steadily increasing.
  • This growing trend holds significant potential for contributing to the global scientific landscape.
  • Further investigation into the characteristics of these studies is warranted to ensure their inclusion in future global analyses.