title: Estimation of effects of factors related to preschooler body mass index using quantile regression model.
abstract: OBJECTIVE
  The purpose of this study was to investigate Korean preschoolers' obesity-related factors through an ecological approach and to identify Korean preschoolers' obesity-related factors and the different effects of ecological variables on body mass index and its quantiles through an ecological approach.
  
  
  METHODS
  The study design was cross-sectional. Through convenience sampling, 241 cases were collected from three kindergartens and seven nurseries in the Seoul metropolitan area and Kyunggi Province in April 2013 using self-administered questionnaires from preschoolers' mothers and homeroom teachers.
  
  
  RESULTS
  Results of ordinary least square regression analysis show that mother's sedentary behavior (p < .001), sedentary behavior parenting (p = .039), healthy eating parenting (p = .027), physical activity-related social capital (p = .029) were significant factors of preschoolers' body mass index. While in the 5% body mass index distribution group, gender (p = .031), preference for physical activity (p = .015), mother's sedentary behavior parenting (p = .032), healthy eating parenting (p = .005), and teacher's sedentary behavior (p = .037) showed significant influences. In the 25% group, the effects of gender and preference for physical activity were no longer significant. In the 75% and 95% group, only mother's sedentary behavior showed a statistically significant influence (p < .001, p = .012 respectively).
  
  
  CONCLUSIONS
  Efforts to lower the obesity rate of preschoolers should focus on their environment, especially on the sedentary behavior of mothers, as mothers are the main nurturers of this age group.
authors.affiliation: College of Nursing, Nursing Policy Research Institute, Yonsei University, Seoul, South Korea.
authors.forename: Hee Soon
authors.initials: HS
authors.lastname: Kim
authors.affiliation: College of Nursing, Yonsei University, Seoul, South Korea. Electronic address: uneepak@naver.com.
authors.forename: Yun Hee
authors.initials: YH
authors.lastname: Park
authors.affiliation: College of Nursing, Yonsei University, Seoul, South Korea.
authors.forename: Hyun Bong
authors.initials: HB
authors.lastname: Park
authors.affiliation: College of Nursing, Yonsei University, Seoul, South Korea.
authors.forename: Su Hee
authors.initials: SH
authors.lastname: Kim
mesh_terms: D000328:Adult; D015992:Body Mass Index; D002675:Child, Preschool; D003430:Cross-Sectional Studies; D005260:Female; D015438:Health Behavior; D007722:Health Knowledge, Attitudes, Practice; D006801:Humans; D008297:Male; D015233:Models, Statistical; D009035:Mothers; D009765:Obesity / Q000453:epidemiology*; D016487:Parenting; D012044:Regression Analysis; D056910:Republic of Korea / Q000453:epidemiology; D012307:Risk Factors; D012931:Social Environment; D011795:Surveys and Questionnaires
keywords: obesity; preschooler; quantile regression