title: [Physical activity patterns of school adolescents: Validity, reliability and percentiles proposal for their evaluation].
abstract: Regular physical activity (PA) during childhood and adolescence is important for the prevention of non-communicable diseases and their risk factors.
  
  
  
  To validate a questionnaire for measuring patterns of PA, verify the reliability, comparing the levels of PA aligned with chronological and biological age, and to develop percentile curves to assess PA levels depending on biological maturation.
  
  
  
  Descriptive cross-sectional study was performed on a sample non-probabilistic quota of 3,176 Chilean adolescents (1685 males and 1491 females), with a mean age range from 10.0 to 18.9 years. An analysis was performed on, weight, standing and sitting height. The biological age through the years of peak growth rate and chronological age in years was determined. Body Mass Index was calculated and a survey of PA was applied. The LMS method was used to develop percentiles.
  
  
  
  The values for the confirmatory analysis showed saturations between 0.517 and 0.653. The value of adequacy of Kaiser-Meyer-Olkin (KMO) was 0.879 and with 70.8% of the variance explained. The Cronbach alpha values ranged from 0.81 to 0.86. There were differences between the genders when aligned chronological age. There were no differences when aligned by biological age. Percentiles are proposed to classify the PA of adolescents of both genders according to biological age and sex.
  
  
  
  The questionnaire used was valid and reliable, plus the PA should be evaluated by biological age. These findings led to the development of percentiles to assess PA according to biological age and gender.
authors.affiliation: Facultad de Educación Física, Universidad Estadual de Campinas, Sao Paulo, Brasil.
authors.forename: Marco
authors.initials: M
authors.lastname: Cossío Bolaños
authors.affiliation: Departamento de Ciencias de la Actividad Física, Universidad Católica del Maule, Talca, Chile.
authors.forename: Jorge
authors.initials: J
authors.lastname: Méndez Cornejo
authors.affiliation: Facultad de Ciencias de la Actividad Física, Universidad San Sebastián, Concepción, Chile.
authors.forename: Cristian
authors.initials: C
authors.lastname: Luarte Rocha
authors.affiliation: Departamento de Ciencias de la Actividad Física, Universidad Católica del Maule, Talca, Chile.
authors.forename: Rodrigo
authors.initials: R
authors.lastname: Vargas Vitoria
authors.affiliation: Escuela de Postgrado, Instituto de Ciencias de la Computación, Universidad Nacional del Altiplano, Puno, Perú.
authors.forename: Bernabé
authors.initials: B
authors.lastname: Canqui Flores
authors.affiliation: Facultad de Educación Física, Universidad Estadual de Campinas, Sao Paulo, Brasil.
authors.forename: Rossana
authors.initials: R
authors.lastname: Gomez Campos
mesh_terms: D000293:Adolescent; D000367:Age Factors; D001827:Body Height / Q000502:physiology*; D015992:Body Mass Index; D001835:Body Weight / Q000502:physiology*; D002648:Child; D002677:Chile; D003430:Cross-Sectional Studies; D015444:Exercise / Q000502:physiology*; D005260:Female; D006801:Humans; D008297:Male; D015203:Reproducibility of Results; D012737:Sex Factors; D011795:Surveys and Questionnaires / Q000592:standards*