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Related Concept Videos

Signs of Puberty01:27

Signs of Puberty

Puberty is a critical phase, typically beginning between the ages of 8 and 13 in girls and 9 and 14 in boys, though timing can vary based on genetics, environmental factors, and overall health. This period is characterized by the development of secondary sexual characteristics and the attainment of reproductive potential. Endocrine changes underpin puberty, with hormonal surges of Luteinizing Hormone (LH) and Follicle-Stimulating Hormone (FSH) instigated by Gonadotropin-Releasing Hormone (GnRH)...
Socioemotional Experience and Gender Development01:30

Socioemotional Experience and Gender Development

Social-emotional experiences and cultural influences play significant roles in shaping gender development. During middle childhood, from ages 6 to 11, peer groups become dominant in reinforcing gender norms. Children in this age group often align with same-gender peer groups, which actively encourage behaviors that conform to traditional gender roles. For instance, boys may be discouraged from engaging in activities perceived as feminine, reinforcing culturally dictated norms about masculinity...
Meiosis I03:09

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Meiosis I01:49

Meiosis I

Meiosis is a carefully orchestrated set of cell divisions, the goal of which—in humans—is to produce haploid sperm or eggs, each containing half the number of chromosomes present in somatic cells elsewhere in the body. Meiosis I is the first such division, and involves several key steps, among them: condensation of replicated chromosomes in diploid cells; the pairing of homologous chromosomes and their exchange of information; and finally, the separation of homologous chromosomes by a...
Meiosis I03:09

Meiosis I

Meiosis is the division of a diploid cell into haploid cells forming sperm and eggs in animals through differentiation. Meiosis I is the first stage of meiosis, where the genetic recombination of homologous chromosomes and the reduction of the ploidy level by half occurs.
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Articles linked to this work by shared authors, journal, and citation graph.

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[Immunization against Haemophilus influenzae type b in Iceland. Results after six years use of PRP-D (ProHIBiT(R).].

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[Feeding patterns and risk factors in an epidemic of neonatal necrotizing enterocolitis.].

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[Puberty in Icelandic boys.].

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Related Experiment Video

Updated: Jul 19, 2026

Determination of Reproductive Competence by Confirming Pubertal Onset and Performing a Fertility Assay in Mice and Rats
06:38

Determination of Reproductive Competence by Confirming Pubertal Onset and Performing a Fertility Assay in Mice and Rats

Published on: October 13, 2018

[Puberty in Icelandic girls.].

A V Thornórsson1, A Dagbjartsson, G I Pálsson

  • 1Childrens hospital, Landspitali University Hospital, Fossvogi, 108 Reykjavík, Iceland. arniv@landspitali.is.

Laeknabladid
|October 5, 2006
PubMed
Summary

This study found that Icelandic girls reach breast development stage 2 (B2) at a mean age of 10.84 years, with menarche occurring 2.42 years later. Pubic hair development also aligns with Western European averages.

Area of Science:

  • Pediatric Endocrinology
  • Human Growth and Development
  • Reproductive Health

Context:

  • Cross-sectional study of 2775 healthy Icelandic girls aged 6-16 years (1983-1987).
  • Part of a larger growth and development study of 5526 Icelandic children.
  • Utilized Tanner staging for physical signs of puberty.

Purpose:

  • To determine the mean age of pubertal onset in Icelandic girls.
  • To establish the timing of key pubertal milestones, including breast development and menarche.
  • To compare pubertal timing in Icelandic girls with international data.

Summary:

  • Mean age for Breast development stage 2 (B2) was 10.84 years (SD 1.43).
  • Mean interval between B2 and menarche was 2.42 years.

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Last Updated: Jul 19, 2026

Determination of Reproductive Competence by Confirming Pubertal Onset and Performing a Fertility Assay in Mice and Rats
06:38

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  • Mean age for Pubic hair stage 2 (PH2) was 11.46 years (SD 1.25), with PH2 to PH5 interval of 3.40 years.

    • Impact:

    • Provides normative data for pubertal development in Icelandic girls.
    • Suggests similar pubertal timing and tempo compared to Nordic and Western European countries.
    • Contributes to understanding geographical variations in human puberty.