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dc.creatorCodner D,Ethel
dc.creatorUnanue M,Nancy
dc.creatorGaete V,Ximena
dc.creatorBarrera P,Alvaro
dc.creatorMook-Kanamori,Dennis
dc.creatorBazaes C,Rodrigo
dc.creatorAvila A,Alejandra
dc.creatorCassorla G,Fernando
dc.date2004-07-01
dc.date.accessioned2020-02-17T15:33:44Z
dc.date.available2020-02-17T15:33:44Z
dc.identifierhttps://scielo.conicyt.cl/scielo.php?script=sci_arttext&pid=S0034-98872004000700003
dc.identifier.urihttps://revistaschilenas.uchile.cl/handle/2250/130932
dc.descriptionBackground: 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)
dc.formattext/html
dc.languagees
dc.publisherSociedad Médica de Santiago
dc.relation10.4067/S0034-98872004000700003
dc.rightsinfo:eu-repo/semantics/openAccess
dc.sourceRevista médica de Chile v.132 n.7 2004
dc.subjectBody mass index
dc.subjectMenarche
dc.subjectPuberty
dc.subjectSex maturation
dc.titleCronología del desarrollo puberal en niñas escolares de Santiago: relación con nivel socio-económico e índice de masa corporal


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