title: Development and validation of a generic scale for use in transition programmes to measure self-management skills in adolescents with chronic health conditions: the TRANSITION-Q.
abstract: OBJECTIVE
  To develop a generic self-management skills scale for use with adolescents diagnosed with a chronic health condition who are aged 12 to 18 years.
  
  
  BACKGROUND
  There is a lack of methodologically sound scales for healthcare teams to use to measure self-management skills in adolescents with chronic conditions transitioning to adult care.
  
  
  METHODS
  Adolescents aged 12 to 18 years with a broad range of chronic health conditions, including neurodevelopmental conditions, were recruited from May to August 2013 from nine outpatient clinics at McMaster Children's Hospital (Canada). Thirty-two participated in a cognitive interview, and 337 completed a questionnaire booklet. Interviews were used to develop the TRANSITION-Q. Rasch measurement theory (RMT) analysis was used to identify items that represent the best indicators of self-management skills. Traditional psychometric tests of measurement performance were also conducted.
  
  
  RESULTS
  The response rate was 92% (32/32 cognitive; 337/371 field test). RMT analysis resulted in a 14-item scale with three response options. The overall fit of the observed data to that expected by the Rasch model was non-significant, providing support that this new scale measured a unidimensional construct. Other tests supported the scale as scientifically sound, e.g. Person Separation Index = 0.82; good item fit statistics; no differential item function by age or gender; low residual correlations between items; Cronbach's alpha = 0.85; test-retest reliability = 0.90; and tests of construct validity that showed, as hypothesized, fewer skills in younger participants and in participants who required assistance to complete the scale. Finally, participants who agreed they are ready to transfer to adult healthcare reported higher TRANSITION-Q scores than did participants who disagreed.
  
  
  CONCLUSIONS
  The TRANSITION-Q is a short, clinically meaningful and psychometrically sound scale. This generic scale can be used in research and in paediatric and adolescent clinics to help evaluate readiness for transition.
authors.affiliation: Department of Pediatrics, McMaster University, Hamilton, ON, Canada.
authors.forename: A F
authors.initials: AF
authors.lastname: Klassen
authors.affiliation: Department of Pediatrics, McMaster University, Hamilton, ON, Canada.
authors.forename: C
authors.initials: C
authors.lastname: Grant
authors.affiliation: Departments of Pediatrics, Pathology and Medicine, McMaster University, Hamilton, ON, Canada.
authors.forename: R
authors.initials: R
authors.lastname: Barr
authors.affiliation: Department of Pediatrics, McMaster University, Hamilton, ON, Canada.
authors.forename: H
authors.initials: H
authors.lastname: Brill
authors.affiliation: CanChild Centre for Childhood Disability Research, Department of Pediatrics, McMaster University, Hamilton, ON, Canada.
authors.forename: O
authors.initials: O
authors.lastname: Kraus de Camargo
authors.affiliation: Department of Pediatrics, McMaster University, Hamilton, ON, Canada.
authors.forename: G M
authors.initials: GM
authors.lastname: Ronen
authors.affiliation: Department of Pediatrics, McMaster University, Hamilton, ON, Canada.
authors.forename: M C
authors.initials: MC
authors.lastname: Samaan
authors.affiliation: Division of Cardiology, Department of Pediatrics, McMaster University, Hamilton, ON, Canada.
authors.forename: T
authors.initials: T
authors.lastname: Mondal
authors.affiliation: Plymouth University Peninsula Schools of Medicine and Dentistry, Plymouth, Devon, UK.
authors.forename: S J
authors.initials: SJ
authors.lastname: Cano
authors.affiliation: Department of Clinical Epidemiology and Biostatistics, McMaster University, Hamilton, ON, Canada.
authors.forename: A
authors.initials: A
authors.lastname: Schlatman
authors.affiliation: Department of Clinical Epidemiology and Biostatistics, McMaster University, Hamilton, ON, Canada.
authors.forename: E
authors.initials: E
authors.lastname: Tsangaris
authors.affiliation: Department of Pediatrics, McMaster University, Hamilton, ON, Canada.
authors.forename: U
authors.initials: U
authors.lastname: Athale
authors.affiliation: Department of Social Policy, The London School of Economics and Political Science, London, UK.
authors.forename: N
authors.initials: N
authors.lastname: Wickert
authors.affiliation: CanChild Centre for Childhood Disability Research, Department of Pediatrics, McMaster University, Hamilton, ON, Canada.
authors.forename: J W
authors.initials: JW
authors.lastname: Gorter
mesh_terms: D000293:Adolescent; D002648:Child; D002908:Chronic Disease / Q000628:therapy*; D003266:Continuity of Patient Care; D005260:Female; D006801:Humans; D007407:Interviews as Topic; D008297:Male; D009864:Ontario; D011594:Psychometrics; D015203:Reproducibility of Results; D012648:Self Care; D011795:Surveys and Questionnaires
keywords: Rasch measurement; adolescents; psychometrics; self-management; transition