Cronología del desarrollo puberal en niñas escolares de Santiago: relación con nivel socio-económico e índice de masa corporal

Background: Recent studies in the United States have demonstrated that a significant proportion of girls show thelarche before the age of eight years. Nutritional status, geographic influences and racial factors are known to affect the timing of puberty. Aim: To evaluate the age of onset of puberty,...

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Autores principales:	Codner D,Ethel, Unanue M,Nancy, Gaete V,Ximena, Barrera P,Alvaro, Mook-Kanamori,Dennis, Bazaes C,Rodrigo, Avila A,Alejandra, Cassorla G,Fernando
Lenguaje:	Spanish / Castilian
Publicado:	Sociedad Médica de Santiago 2004
Materias:	Body mass index Menarche Puberty Sex maturation
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0034-98872004000700003
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spelling	oai:scielo:S0034-988720040007000032004-12-13Cronología del desarrollo puberal en niñas escolares de Santiago: relación con nivel socio-económico e índice de masa corporalCodner D,EthelUnanue M,NancyGaete V,XimenaBarrera P,AlvaroMook-Kanamori,DennisBazaes C,RodrigoAvila A,AlejandraCassorla G,Fernando Body mass index Menarche Puberty Sex maturation Background: Recent studies in the United States have demonstrated that a significant proportion of girls show thelarche before the age of eight years. Nutritional status, geographic influences and racial factors are known to affect the timing of puberty. Aim: To evaluate the age of onset of puberty, development of secondary sexual characteristics and menarche in Chilean girls, and its relation to obesity and socioeconomic status. Material and methods: Healthy girls attending elementary school, from first to ninth grade in Santiago, Chile, were studied. A pediatric endocrinologist evaluated pubertal development using Tanner classification. Breast development was assessed by inspection and breast palpation. Average age of onset of pubertal events was determined by probit analysis. Results: A total of 758 girls, aged 5.8 to 16.1 years, were recruited. Obesity, defined as a BMI greater than 90th percentile, was found in 24.4%. The age of menarche was 12.7 years, the onset of Tanner stage 2 breast development and pubic hair was at 8.9 and 10.4 years, respectively. Sixteen percent of girls aged 7 to 7,9 years, had thelarche. Upper class girls showed a later onset of breast Tanner stage 4 stage than low-middle class girls. Obesity was not found in logistic regression analysis to be a significant predictive factor in the onset of puberty. Conclusions: The age of menarche has not changed in the last thirty years, but an earlier onset of thelarche has occurred. The high frequency of thelarche between 7 and 8 years suggests that the normal age of breast development should be revised (Rev Méd Chile 2004; 132: 801-8)info:eu-repo/semantics/openAccessSociedad Médica de SantiagoRevista médica de Chile v.132 n.7 20042004-07-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0034-98872004000700003es10.4067/S0034-98872004000700003
institution	Scielo Chile
collection	Scielo Chile
language	Spanish / Castilian
topic	Body mass index Menarche Puberty Sex maturation
spellingShingle	Body mass index Menarche Puberty Sex maturation Codner D,Ethel Unanue M,Nancy Gaete V,Ximena Barrera P,Alvaro Mook-Kanamori,Dennis Bazaes C,Rodrigo Avila A,Alejandra Cassorla G,Fernando Cronología del desarrollo puberal en niñas escolares de Santiago: relación con nivel socio-económico e índice de masa corporal
description	Background: Recent studies in the United States have demonstrated that a significant proportion of girls show thelarche before the age of eight years. Nutritional status, geographic influences and racial factors are known to affect the timing of puberty. Aim: To evaluate the age of onset of puberty, development of secondary sexual characteristics and menarche in Chilean girls, and its relation to obesity and socioeconomic status. Material and methods: Healthy girls attending elementary school, from first to ninth grade in Santiago, Chile, were studied. A pediatric endocrinologist evaluated pubertal development using Tanner classification. Breast development was assessed by inspection and breast palpation. Average age of onset of pubertal events was determined by probit analysis. Results: A total of 758 girls, aged 5.8 to 16.1 years, were recruited. Obesity, defined as a BMI greater than 90th percentile, was found in 24.4%. The age of menarche was 12.7 years, the onset of Tanner stage 2 breast development and pubic hair was at 8.9 and 10.4 years, respectively. Sixteen percent of girls aged 7 to 7,9 years, had thelarche. Upper class girls showed a later onset of breast Tanner stage 4 stage than low-middle class girls. Obesity was not found in logistic regression analysis to be a significant predictive factor in the onset of puberty. Conclusions: The age of menarche has not changed in the last thirty years, but an earlier onset of thelarche has occurred. The high frequency of thelarche between 7 and 8 years suggests that the normal age of breast development should be revised (Rev Méd Chile 2004; 132: 801-8)
author	Codner D,Ethel Unanue M,Nancy Gaete V,Ximena Barrera P,Alvaro Mook-Kanamori,Dennis Bazaes C,Rodrigo Avila A,Alejandra Cassorla G,Fernando
author_facet	Codner D,Ethel Unanue M,Nancy Gaete V,Ximena Barrera P,Alvaro Mook-Kanamori,Dennis Bazaes C,Rodrigo Avila A,Alejandra Cassorla G,Fernando
author_sort	Codner D,Ethel
title	Cronología del desarrollo puberal en niñas escolares de Santiago: relación con nivel socio-económico e índice de masa corporal
title_short	Cronología del desarrollo puberal en niñas escolares de Santiago: relación con nivel socio-económico e índice de masa corporal
title_full	Cronología del desarrollo puberal en niñas escolares de Santiago: relación con nivel socio-económico e índice de masa corporal
title_fullStr	Cronología del desarrollo puberal en niñas escolares de Santiago: relación con nivel socio-económico e índice de masa corporal
title_full_unstemmed	Cronología del desarrollo puberal en niñas escolares de Santiago: relación con nivel socio-económico e índice de masa corporal
title_sort	cronología del desarrollo puberal en niñas escolares de santiago: relación con nivel socio-económico e índice de masa corporal
publisher	Sociedad Médica de Santiago
publishDate	2004
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0034-98872004000700003
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Cronología del desarrollo puberal en niñas escolares de Santiago: relación con nivel socio-económico e índice de masa corporal

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