Frignani Renata Rago, Passos Maria Aparecida Zanetti, Ferrari Gerson Luis de Moraes, Niskier Sheila Rejane, Fisberg Mauro, Cintra Isa de Pádua
Division of Adolescent Medicine, Centro de Atendimento e Apoio ao Adolescente (CAAA), Department of Pediatrics, Universidade Federal de São Paulo (UNIFESP), São Paulo, SP, Brazil.
Division of Adolescent Medicine, Centro de Atendimento e Apoio ao Adolescente (CAAA), Department of Pediatrics, Universidade Federal de São Paulo (UNIFESP), São Paulo, SP, Brazil; Centro de Estudos do Laboratório de Aptidão Física de São Caetano do Sul (CELAFISCS), São Paulo, SP, Brazil.
J Pediatr (Rio J). 2015 May-Jun;91(3):248-55. doi: 10.1016/j.jped.2014.07.009. Epub 2014 Dec 2.
To develop reference curves for the body fat index (BFI) in the pediatric population, in adolescents from the city of São Paulo, Brazil, and verify their association with body mass index and body fat percentage.
The study is part of the research project "Nutritional Profile of Adolescents from Public and Private Schools of São Paulo" that was performed in 2004-2005. A total of 4,686 adolescents (2,130 boys and 2,556 girls) aged 10-15 years were divided into two groups: 10-12 and 13-15 years of age. Body mass, height, body mass index, hip circumference, body fat percentage, body fat index, and sexual maturation performed by the self-assessment method (prepubertal, pubertal, and postpubertal) were analyzed. ANOVA was performed, as well as percentile distribution, Pearson's correlation, and Bland-Altman plot.
In boys, there was an increase in body mass, height, body mass index, and hip circumference with advancing age and Tanner stage. In girls, there was an increase in body fat index and body fat percentage with advancing age and stage of sexual maturation. An association was found between body fat index and body mass index (r = 0.67 in boys and 0.80 in girls, p < 0.001) and body fat percentage (r = 0.71 in boys and 0.68 in girls, p<0.001).
The body fat index seems to reflect well the phenomena of sexual dimorphism in adolescence, is easy to perform, and represents a method that should be used in population samples.
制定巴西圣保罗市青少年人群体脂指数（BFI）的参考曲线，并验证其与体重指数和体脂百分比的关联。
本研究是2004 - 2005年开展的“圣保罗公立和私立学校青少年营养状况”研究项目的一部分。共有4686名10 - 15岁的青少年（2130名男孩和2556名女孩）被分为两组：10 - 12岁组和13 - 15岁组。分析了体重、身高、体重指数、臀围、体脂百分比、体脂指数以及通过自我评估法（青春期前、青春期和青春期后）评估的性成熟情况。进行了方差分析、百分位数分布分析、Pearson相关性分析以及Bland - Altman图分析。
在男孩中，随着年龄增长和坦纳分期的推进，体重、身高、体重指数和臀围增加。在女孩中，随着年龄增长和性成熟阶段的推进，体脂指数和体脂百分比增加。发现体脂指数与体重指数（男孩r = 0.67，女孩r = 0.80，p < 0.001）以及体脂百分比（男孩r = 0.71，女孩r = 0.68，p < 0.001）之间存在关联。
体脂指数似乎能很好地反映青春期的性别二态性现象，操作简便，是一种应用于人群样本的方法。
