Sexual Maturation Of Schoolchildren With Low Socio-economic Level From Rio Branco - Ac [maturação Sexual Em Escolares De Baixo Nível Socioeconômico Da Cidade De Rio Branco-ac]

The objective this study was to verify the schoolgirl sexual maturation in a public school from Rio Branco (AC). It was a longitudinal study for 3 consecutive years (2003 to 2005), with the same group of girls who studied at grades 5 or 6 in a school from Rio Branco (AC). The method proposed by Marshall and Tanner to evaluate beast and pubic. The age of menarche was obtained prospectively. The classification of sexual maturation was done according to Vitalle et al. The nutritional status was evaluated by bone mass index according to NCHS data and the socioeconomic evaluation, by ABEP (2003) patterns. From 44 schoolgirls who completed the study, 39 (89%) were from middle-lower or lower socio-economic level; and 30 (68%) in 2003 and 21 (48%) were malnourished. In 2003, 35 (79%) had initiated the puberty and only 8 (18%) have presented menarche; while in 2005, 39 (89%) presented advanced or complete stages of sexual development and 37 (84%) menarche. The mean age of menarche was 12.7 + 0.7 years. This sample of girls of a public school from North Region of Brazil showed similar data of menarche in comparison from other national and international studies. The advanced puberty observed in some recent studies was not observed in this sample, probably due to the socio-economic level and the nutritional status without obesity.834550Parent, A.S., Teilmann, G., Juul, A., Skakkebaek, N.E., Toparri, J., Bourguignon, J.P., The timing of normal puberty and the age limits of sexual precocity: Variations around the world, secular trends, and changes after migration (2003) Endocr Rev, 24, pp. 668-693Sun, S.S., Schubert, C.M., Chumlea, W.C., Roche, A.F., Kulin, H.E., Lee, P.A., National estimates of the timing maturation and racial differences among US children (2002) Pediatrics, 110, pp. 911-919Borges, G.A., Schwarztbach, C., Idade da menarca em adolescentes de Marechal Cândido Rondon-PR (2003) Rev Bras Cineantropom Desempenho Hum, 5, pp. 15-21Moreira, D.M., Fragoso, M.I.J., Oliveira Jr., A.V., Níveis maturacional e socioeconômico de jovens sambistas do Rio de Janeiro (2004) Rev Bras Med Esporte, 10, pp. 16-23Oliveira, C.S., Veiga, G.V., Estado nutricional e maturação sexual de adolescentes de uma escola pública e de uma escola particular do Município do Rio de Janeiro (2005) Rev Nutr, 18, pp. 183-191Petroski, E.L., Duarte, M.F.S., Matsudo, V.K.R., Idade de menarca em escolares catarinenses (1983) Rev Educ Física UEM, 4, pp. 3-6Petroski, E.L., De Bem, M.F.L., Pires Neto, C.S., Maturação sexual morfológica e somática em escolares recémmaturadas de diferentes níveis sócio-econômicos (1995) Rev Ass Prof Educ Física Londrina, 10, pp. 16-27Marshall, W.A., Tanner, S.M., Variations in the pattern of puberal changes in girls (1969) Arch Dis Child, 44, pp. 291-303Marshall, W.A., Tanner, S.M., Variations in the pattern of puberal changes in girls (1970) Arch Dis Child, 45, pp. 13-23Lee, P.A., Normal ages of pubertal events among American males and females (1980) J Adolesc Health Care, 1, pp. 26-29Largo, R.H., Gasser, T.H., Prader, A., Stuetzie, E.W., Huber, P.J., Analysis of the adolescent growth sport using smoothing splice functions (1978) Ann Hum Biol, 5, pp. 421-434Colli, A.S., (1988) Crescimento e desenvolvimento pubetário em crianças e adolescentes brasileiras VI: Maturação sexual, , São Paulo: Editora Brasileira de CiênciasHerman-Giddens, M.E., Slora, E.J., Wasserman, R.C., Bourdony, M.V.B., Bhapkar, M.V., Koch, G.G., Secondary sexual characteristics and menses in young girls seen in office practice: A study from the Pediatric Research in Office Settings network (1997) Pediatrics, 99, pp. 505-512Matsudo, S.M.M., Matsudo, V.K.R., Self-assessment and physician-assessment of sexual maturation in Brazilian boys and girls: Concordance and reproducibility (1994) Am J Hum Biol, 6, pp. 451-454Vitalle, M.S.S., Tamioka, C.Y., Juliano, Y., Amâncio, O.M.S., Índice de massa corporal, desenvolvimento puberal e sua relação com a menarca (2003) Rev Ass Med Brasil, 49 (4), pp. 429-433Centers for Disease Control & Prevention (CDC), , http://www.cdc.gov/nchs/data/nhanes/growthcharts, National Center for Health Statistics (NCHS), Disponível em, [2006 jun 12]http://www.abep.org, Associação Brasileira de Empresas de Pesquisa-ABEP. Critério de Classificação Econômica Brasil. 2003. Disponível em, [2006 jun 12]Malina, R.M., Secular changes in size and maturity: Causes and effects (1979) Monogr Soc Res Child Dev, 44, pp. 59-102Grumbach, M.M., Styne, D.M., Puberty: Ontogeny, neuroendocrinology, physiology, and disorders (2003) Willians Textbook of Endocrinology, pp. 1117-1286. , In: Larsen PR, Kronenberg HM, Melmed S, Polosky KS, Philadelphia: SaundersGonzales, G.F., Villena, A., Ubilluz, M., Age at menarche in Peruvian girls at sea level and high altitude: Effect of ethnic background and socioeconomic status (1996) Hum Biol, 8, pp. 457-463Khan, A.D., Schroeder, D.G., Martorella, R., Haas, J.D., Rivera, J., Early childhood determinants of age at menarche in rural Guatemala (1996) Am J Hum Biol, 8, pp. 717-723Ohsawa, S., Ji, C., Kasai, N., Age at menarche and comparison of the growth and performance of preand post-menarcheal girls in China (1997) Am J Hum Biol, 9, pp. 205-212Apraiz, A.G., Influence of family size and birth order on menarcheal age of girls from Bilbao City (Biscay, Basque Country) (1999) Am J Hum Biol, 11, pp. 779-783Wu, T., Mendola, P., Buck, G.M., Ethnic differences in the presence of secondary sex characteristics and menarche among US girls: The third national health and nutrition examination survey, 1988-1994 (2002) Pediatrics, 110, pp. 752-757Lin-Su, K., Vogiatzi, M.G., New, M.I., Body mass index and age at menarche in an adolescent clinic population (2002) Clin Pediatr, 41, pp. 501-507Tang, C., Yeung, D., Lee, A.M., Psychosocial correlates of emotional responses to menarche among Chinese adolescent girls (2003) J Adolesc Health, 33, pp. 193-201Garnier, D., Simondon, K.B., Bénéfice, E., Longitudinal estimates of puberty timing in Senegalese adolescence girls (2005) Am J Hum Biol, 17, pp. 718-730Scaf, G., Freitas, J.A.S., Damante, J.H., Determinação da idade da menarca em meninas brancas, Brasileiras, da Região de Bauru (1984) Pediatr (São Paulo), 6, pp. 63-68Souza, E.A.C., Medeiros Filho, J.G., Souza, E.S.M., Estudo da maturação sexual em escolares do sexo feminino no Município de João Pessoa-Paraíba (1996) Pediatria, 18, pp. 59-64Petroski, E.L., Velho, N.M., De Bem, M.F.L., Idade de menarca e satisfação com o peso corporal (1999) Rev Bras Cineantropom Desempenho Hum, 1, pp. 30-36Tavares, C.H.F., Haeffner, L.S.B., Barbieri, M.A., Bettiol, H., Barbieri, M.R., Souza, L., Idade da menarca em escolares de uma comunidade rural do Sudeste do Brasil (2000) Cad Saude Publ, 16, pp. 709-715McHado, D.R.L., Barbanti, V.J., Estado de maturação e aptidão motora em escolares do sexo feminino (2003) Rev Bras Ativ Fís Saúde, 8, pp. 5-1