title: Evaluation of the predictive capacity of vertical segmental tetrapolar bioimpedance for excess weight detection in adolescents.
abstract: OBJECTIVE
  To analyze the predictive capacity of the vertical segmental tetrapolar bioimpedance apparatus in the detection of excess weight in adolescents, using tetrapolar bioelectrical impedance as a reference.
  
  
  METHODS
  This was a cross-sectional study conducted with 411 students aged between 10 and 14 years, of both genders, enrolled in public and private schools, selected by a simple and stratified random sampling process according to the gender, age, and proportion in each institution. The sample was evaluated by the anthropometric method and underwent a body composition analysis using vertical bipolar, horizontal tetrapolar, and vertical segmental tetrapolar assessment. The ROC curve was constructed based on calculations of sensitivity and specificity for each point of the different possible measurements of body fat. The statistical analysis used Student's t-test, Pearson's correlation coefficient, and McNemar's chi-squared test. Subsequently, the variables were interpreted using SPSS software, version 17.0.
  
  
  RESULTS
  Of the total sample, 53.7% were girls and 46.3%, boys. Of the total, 20% and 12.5% had overweight and obesity, respectively. The body segment measurement charts showed high values of sensitivity and specificity and high areas under the ROC curve, ranging from 0.83 to 0.95 for girls and 0.92 to 0.98 for boys, suggesting a slightly higher performance for the male gender. Body fat percentage was the most efficient criterion to detect overweight, while the trunk segmental fat was the least accurate indicator.
  
  
  CONCLUSIONS
  The apparatus demonstrated good performance to predict excess weight.
authors.affiliation: Departamento de Nutrição, Instituto de Ciências Biológicas, Universidade Federal de Juiz de Fora (UFJF), Juiz de Fora, MG, Brazil.
authors.forename: Felipe Silva
authors.initials: FS
authors.lastname: Neves
authors.affiliation: Departamento de Nutrição, Instituto de Ciências Biológicas, Universidade Federal de Juiz de Fora (UFJF), Juiz de Fora, MG, Brazil.
authors.forename: Danielle Aparecida Barbosa
authors.initials: DA
authors.lastname: Leandro
authors.affiliation: Departamento de Nutrição, Instituto de Ciências Biológicas, Universidade Federal de Juiz de Fora (UFJF), Juiz de Fora, MG, Brazil.
authors.forename: Fabiana Almeida da
authors.initials: FA
authors.lastname: Silva
authors.affiliation: Departamento de Nutrição, Instituto de Ciências Biológicas, Universidade Federal de Juiz de Fora (UFJF), Juiz de Fora, MG, Brazil.
authors.forename: Michele Pereira
authors.initials: MP
authors.lastname: Netto
authors.affiliation: Departamento de Nutrição, Instituto de Ciências Biológicas, Universidade Federal de Juiz de Fora (UFJF), Juiz de Fora, MG, Brazil.
authors.forename: Renata Maria Souza
authors.initials: RM
authors.lastname: Oliveira
authors.affiliation: Departamento de Nutrição, Instituto de Ciências Biológicas, Universidade Federal de Juiz de Fora (UFJF), Juiz de Fora, MG, Brazil. Electronic address: anapaula.candido@ufjf.edu.br.
authors.forename: Ana Paula Carlos
authors.initials: AP
authors.lastname: Cândido
mesh_terms: D000293:Adolescent; D015992:Body Mass Index; D001938:Brazil / Q000453:epidemiology; D002648:Child; D003430:Cross-Sectional Studies; D017097:Electric Impedance; D005260:Female; D006801:Humans; D008297:Male; D009765:Obesity / Q000175:diagnosis* / Q000453:epidemiology; D011237:Predictive Value of Tests; D012680:Sensitivity and Specificity; D049629:Waist-Hip Ratio
keywords: Adolescent health; Body composition; Composição corporal; Electric impedance; Impedância elétrica; Obesidade; Obesity; Saúde do adolescente