title: Psychometric properties of the Finnish version of the Young Person's Clinical Outcomes in Routine Evaluation (YP-CORE) questionnaire.
abstract: BACKGROUND
  An increasing need exists for suitable measures to evaluate treatment outcome in adolescents. YP-CORE is a pan-theoretical brief questionnaire developed for this purpose, but it lacks studies in different cultures or languages.
  
  
  OBJECTIVE
  To explore the acceptability, factor structure, reliability, validity, and sensitivity to change of the Finnish translation of YP-CORE.
  
  
  METHODS
  The study was conducted at the Department of Adolescent Psychiatry, Helsinki University Central Hospital. A Finnish translation was prepared by a team of professionals and adolescents. A clinical sample of 104 patients was asked to complete the form together with BDI-21 and BAI, and 92 of them filled the forms again after a 3-month treatment. Analysis included acceptability, confirmatory factor analysis, internal and test-re-test reliability, concurrent validity, influence of gender and age, and criteria for reliable change.
  
  
  RESULTS
  YP-CORE was well accepted, and the rate of missing values was low. Internal consistency (α = 0.83-.92) and test-re-test reliability were good (r = 0.69), and the results of CFA supported a one-factor model. YP-CORE showed good concurrent validity against two widely used symptom-specific measures (r = 0.62-0.87). Gender had a moderately strong effect on the scores (d = 0.67), but the effect of age was not as evident. The measure was sensitive to change, showing a larger effect size (d = 0.55) than in the BDI-21 and BAI (d = 0.31-0.50).
  
  
  CONCLUSIONS
  The results show that the translation of YP-CORE into Finnish has been successful, the YP-CORE has good psychometric properties, and the measure could be taken into wider use in clinical settings for outcome measurement in adolescents.
authors.affiliation: a Adolescent Psychiatry , University of Helsinki and Helsinki University Hospital , Helsinki, Finland.
authors.forename: Vera
authors.initials: V
authors.lastname: Gergov
authors.affiliation: b Institute of Behavioural Sciences (Psychology) and Collegium for Advanced Studies, University of Helsinki , Helsinki, Finland.
authors.forename: Jari
authors.initials: J
authors.lastname: Lahti
authors.affiliation: a Adolescent Psychiatry , University of Helsinki and Helsinki University Hospital , Helsinki, Finland.|c Mental Health Unit , National Institute for Health and Welfare , Helsinki, Finland.
authors.forename: Mauri
authors.initials: M
authors.lastname: Marttunen
authors.affiliation: d Institute of Behavioural Sciences (Psychology) , University of Helsinki , Helsinki, Finland.
authors.forename: Jari
authors.initials: J
authors.lastname: Lipsanen
authors.affiliation: e University of Roehampton , London , UK.
authors.forename: Chris
authors.initials: C
authors.lastname: Evans
authors.affiliation: a Adolescent Psychiatry , University of Helsinki and Helsinki University Hospital , Helsinki, Finland.
authors.forename: Klaus
authors.initials: K
authors.lastname: Ranta
authors.affiliation: f Faculty of Social Sciences, Department of Psychology , University of Jyväskylä , Jyväskylä, Finland.
authors.forename: Aarno
authors.initials: A
authors.lastname: Laitila
authors.affiliation: g Forensic Psychiatry , University of Helsinki and Helsinki University Hospital , Helsinki, Finland.
authors.forename: Nina
authors.initials: N
authors.lastname: Lindberg
mesh_terms: D000293:Adolescent; D003431:Cross-Cultural Comparison; D005260:Female; D005387:Finland; D006801:Humans; D008297:Male; D001523:Mental Disorders / Q000175:diagnosis / Q000523:psychology / Q000628:therapy*; D017063:Outcome Assessment, Health Care / Q000706:statistics & numerical data*; D011594:Psychometrics / Q000706:statistics & numerical data*; D015203:Reproducibility of Results; D012647:Self-Assessment; D011795:Surveys and Questionnaires; D014175:Translating
keywords: The Young Person’s Clinical Outcomes in Routine Evaluation; adolescence; outcome measures; psychometric properties