title: First Report on Self-Rated Health in a Nationally-Representative Sample of Iranian Adolescents: The CASPIAN-iii study.
abstract: OBJECTIVE
  To evaluate predictive factors of adolescents' appraisal of their health.
  
  
  METHODS
  The nationwide study, entitled "Childhood and Adolescence Surveillance and Prevention of Adult Non-communicable Diseases (CASPIAN) study", was conducted in 2010 among Iranian school students, aged 10-18. In addition to demographic factors and physical examination, variables as family structure, nutrition habits, physical activity, smoking, hygienic habits, violence, school attachment, family smoking, and family history of chronic diseases were assessed. The dependent variable is the self-rated health (SRH) and it was measured by 12 items, which had already been combined through latent class analysis. We had taken a dichotomous variable, i.e. the higher values indicate better SRH. The dependent variable was regressed on all predictors by generalized additive models.
  
  
  RESULTS
  75% of adolescents had a good SRH. The linear and smooth effects of independent variables on SRH were observed. Among all the variables, physical activity had a positive linear effect on SRH (β = 0.08, P value = 0.003). Smoking, violence, and family history of disease associated to SRH non-linearly (P value < 0.05). Family smoking (β = -0.01) and hygienic habits (β = 0.27) related to SRH both linearly and non-linearly.
  
  
  CONCLUSIONS
  Physical health and high risk behavior, either of linear or non-linear effect, are factors, which seem to shape the adolescents' perception of health.
authors.affiliation: Department of Bio-statistics and Epidemiology, School of Health, Isfahan University of Medical Sciences, Isfahan, Iran.
authors.forename: Mohsen
authors.initials: M
authors.lastname: Hosseini
authors.forename: Mahboobeh
authors.initials: M
authors.lastname: Maghami
authors.forename: Roya
authors.initials: R
authors.lastname: Kelishadi
authors.forename: Mohammad Esmaeil
authors.initials: ME
authors.lastname: Motlagh
authors.forename: Soheila
authors.initials: S
authors.lastname: Khoshbin
authors.forename: Amir
authors.initials: A
authors.lastname: Amirkhani
authors.forename: Ramin
authors.initials: R
authors.lastname: Heshmat
authors.forename: Mahnaz
authors.initials: M
authors.lastname: Taslimi
authors.forename: Gelayol
authors.initials: G
authors.lastname: Ardalan
authors.forename: Sayed Mohsen
authors.initials: SM
authors.lastname: Hosseini
keywords: Adolescents; health status; health status indicator; logistic models; non-parametric statistics; school; self-report
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