title: [Cross-sectional association between sedentary behaviors and anthropometric indexes among children and adolescents in Chengdu City].
abstract: OBJECTIVE
  To examine the situation of sedentary behaviors and anthropometric indexes among children and adolescents in Chengdu city.
  
  
  METHODS
  A total of 2164 children and adolescents aged 7 - 15 years old were recruited in Chengdu city by using cluster random sampling method. This study was a cross-sectional study, which aimed to collect data on anthropometry including height and weight etc. and information on sedentary behavior by using the self-designed questionnaire.
  
  
  RESULTS
  The time spent on watching TV, using computer and doing homework was longer in boys than that in girls. After having been stratified by gender and age groups, the time spent on sedentary behaviors (including watching TV, using computer and doing homework) was longer in 13 - 15 age group than that in. 10 - 12 and 7 -9 age groups in boys. Similar results were obtained in girls. BMI z-scores and the percentage of body fat (BF%) were higher in girls than that in boys (P < 0.0001). BMI z-scores in boys decreased with increasing age after having been stratified by gender and age groups and BF% was higher in 10 - 12 age group. However, BF% in girls was increased with increasing age (P < 0.0001). As three sedentary behaviors were classified into low/high respectively, BF% increased with the time spent on watching TV and doing homework increasing in 10 - 12 age group in girls. The time spent on watching TV increased withthe BMI z-scores increasing.
  
  
  CONCLUSIONS
  The time spending on watching TV, using computer and doing homework increased with increasing age among children and adolescents in Chengdu. Sedenatry behaviors in girls may be related to BMI z-scores and BF%.
authors.forename: Hongmei
authors.initials: H
authors.lastname: Xue
authors.forename: Ruonan
authors.initials: R
authors.lastname: Duan
authors.forename: Yan
authors.initials: Y
authors.lastname: Liu
authors.forename: Mingzhe
authors.initials: M
authors.lastname: Yang
authors.forename: Guo
authors.initials: G
authors.lastname: Cheng
mesh_terms: D000273:Adipose Tissue; D000293:Adolescent; D000886:Anthropometry; D001827:Body Height; D001835:Body Weight; D002648:Child; D003430:Cross-Sectional Studies; D015444:Exercise; D005260:Female; D006801:Humans; D008297:Male; D057185:Sedentary Behavior; D011795:Surveys and Questionnaires