Background: The aim for this study was to assess the construct validity and reliability of the Health Dialogue Questionnaire (HDQ), 7th grade in compulsory school through comparison of the HDQ, with Paediatric Quality Of Life Inventory (PedsQLTM), Local monitoring of youth policy questionnaire (LUPP®) and Health behaviour in Swedish school-aged children (HBSC).Design and methods: A sample was created from HDQ (n= 2008), PedsQLTM (n=477), LUPP (n=2648), HBSC, (n=1500) andan exploratory factor analysis was performed in order to evaluate the construct validity of HDQ of the school children´s health in school settings.Results: The results supported the HDQ as a valid 24 items factorial model, for girls a five factorial model and for boys a four factorial model for school children aged 13 years old (grade 7). The girls' model explained 63 % of the variance, while the boys' model explained 58 % of the variance. A majority of the questions showed an agreeable concurrent and discriminant validity.Conclusions: The HDQ questionnaire is a valid instrument for measuring 13-year-old school children's self-reported-health.Keywords: Adolescents; Construct Validity; Factor Analysis; Health Dialogue Questionnaire; Health Promotion