title: [Agreement between two cutoff points for physical activity and associated factors in young individuals].
abstract: OBJECTIVE
  To analyze the agreement between two cutoff points for physical activity (300 and 420 minutes/week) and associated factors in youth.
  
  
  METHODS
  The study enrolled 738 adolescents of Londrina city, Paraná, Southern Brazil. The following variables were collected by a self report questionnaire: presence of moderate to vigorous physical activity, gender, age, father and mother education level, with whom the adolescent lives, number of siblings, physical activity perception, participation in Physical Education classes, facilities available to physical activity practice and sedentary behavior. Prevalence of physical activity between criterions were compared using McNemar test and the agreement was analysed by Kappa index. Multivariate analysis was performed using Poisson regression with robust variance adjustment was applied.
  
  
  RESULTS
  The prevalence for physical activity was significantly different: 22,3% for 300 minutes/week and 12,8% for 420 minutes/week (p<0,05), but the agreement was strong (k=0,82, p<0,001). The variables gender, father education, physical activity perception and sedentary behavior were associated to physical activity in both analyzed criteria. Participation in Physical Education class and facilities available to physical activity practice were associated to physical activity only with 300 minutes/week cutoff point.
  
  
  CONCLUSIONS
  Caution is suggested regarding cutoffs use for physical activity in epidemiological studies, considering they can result in differences in prevalence of physical activity and its associated factors.
authors.affiliation: Universidade Estadual de Londrina (UEL), Londrina, PR, Brasil.
authors.forename: Diogo Henrique Constantino
authors.initials: DH
authors.lastname: Coledam
authors.affiliation: Universidade Estadual de Londrina (UEL), Londrina, PR, Brasil.
authors.forename: Philippe Fanelli
authors.initials: PF
authors.lastname: Ferraiol
authors.affiliation: Universidade Estadual de Londrina (UEL), Londrina, PR, Brasil.
authors.forename: Raymundo
authors.initials: R
authors.lastname: Pires
authors.affiliation: Universidade Estadual de Londrina (UEL), Londrina, PR, Brasil.
authors.forename: Edinéia Aparecida Gomes
authors.initials: EA
authors.lastname: Ribeiro
authors.affiliation: Universidade Estadual de Londrina (UEL), Londrina, PR, Brasil.
authors.forename: Marco Antonio Cabral
authors.initials: MA
authors.lastname: Ferreira
authors.affiliation: Universidade Estadual de Londrina (UEL), Londrina, PR, Brasil.
authors.forename: Arli Ramos
authors.initials: AR
authors.lastname: de Oliveira
mesh_terms: D000293:Adolescent; D002648:Child; D003430:Cross-Sectional Studies; D015444:Exercise; D005260:Female; D006801:Humans; D008297:Male; D010806:Physical Education and Training; D013997:Time Factors
keywords: Adolescent; Adolescente; Atividade motora/critério; Motor activity/criteria; Public health; Saúde pública