The timing of normal puberty and the age limits of sexual precocity: variations around the world, secular trends, and changes after migration.

@article{Parent2003TheTO,
  title={The timing of normal puberty and the age limits of sexual precocity: variations around the world, secular trends, and changes after migration.},
  author={Anne-Simone Parent and Grete K. Teilmann and Anders Juul and Niels E. Skakkebaek and Jorma Toppari and Jean Pierre Bourguignon},
  journal={Endocrine reviews},
  year={2003},
  volume={24 5},
  pages={
          668-93
        }
}
During the past decade, possible advancement in timing of puberty has been reported in the United States. In addition, early pubertal development and an increased incidence of sexual precocity have been noticed in children, primarily girls, migrating for foreign adoption in several Western European countries. These observations are raising the issues of current differences and secular trends in timing of puberty in relation to ethnic, geographical, and socioeconomic background. None of these… 

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References

SHOWING 1-10 OF 309 REFERENCES
Current age of onset of puberty.
TLDR
It is concluded that aggressive evaluation and treatment in girls with the onset of puberty after 6 (African-Americans) or 7 (white) years of age are unlikely to be beneficial and that the normal age of puberty is occurring earlier.
Trends in pubertal development in Europe
TLDR
The four Dutch nationwide growth surveys are useful examples assessing the secular trend in pubertal development over the past 45 years, with Genetic and environmental factors contribute to the secular changes.
Anthropometry in Adolescence -Secular Trends, Adoption, Ethnic and Environmental Differences
TLDR
The studies reported here indicate the critical importance of optimal intra-uterine, infant and childhood growth as a basis for satisfactory growth during adolescence.
Secular Trends in Pubertal Development
TLDR
More longitudinal studies are needed to understand the short- and long-term consequences of secular changes in both final height and pubertal development before the authors know how important the trends are.
Anthropometry in adolescence--secular trends, adoption, ethnic and environmental differences.
TLDR
The studies reported here indicate the critical importance of optimal intra-uterine, infant and childhood growth as a basis for satisfactory growth during adolescence.
Effects of changes in nutritional conditions on timing of puberty: clinical evidence from adopted children and experimental studies in the male rat.
TLDR
Among 32 patients with idiopathic central precocious puberty seen during a 3-year period, 1/4 were adopted children from developing countries who showed early sexual maturation during the catch-up process following their arrival in Belgium, and evaluated the effect of variations in early nutritional conditions on hypothalamic and testicular maturation.
Pathogenesis and epidemiology of precocious puberty. Effects of exogenous oestrogens
TLDR
The risk for children to develop precocious puberty through exposure to oestrogens in the environment or in food is very low, Nevertheless, studies of the effects of defined environmental oestrogenic substances on the human reproductive system and on pubertal development are warranted.
Factors Affecting Onset of Puberty
TLDR
Data indicate that early malnutrition during a critical developmental time window may have long-lasting effects on pubertal development, including gonadal maturation in both humans and rats.
Reexamination of the Age Limit for Defining When Puberty Is Precocious in Girls in the United States: Implications for Evaluation and Treatment
TLDR
The current recommendation that breast development before age 8 is precocious is based on outdated studies, and new guidelines propose that girls with either breast development or pubic hair should be evaluated if this occurs before age 7 in white girls and before age 6 in African-American girls.
Precocious puberty. A report of 96 cases.
TLDR
In the hope that a relatively long follow-up of a group of patients with precocious puberty would shed some light on the natural history of the process, the present study undertook.
...
...