title: Development and validation of a disease-specific quality-of-life measure for children with achalasia.
abstract: BACKGROUND
  Achalasia is an uncommon oesophageal motility disorder occasionally affecting children. Children with achalasia can experience significant morbidity, and quality-of- life (QoL) has never been studied in this population.
  
  
  OBJECTIVE
  The aim was to develop a disease-specific quality-of-life (DS-QoL) measure for children with achalasia.
  
  
  METHODS
  Item response theory methods were used to develop the DS-QoL measure. The construct validity of this measure was assessed by comparing items and domains with the generic PedsQL questionnaire. Reliability was assessed using Cronbach's alpha coefficient for internal consistency.
  
  
  RESULTS
  17 children completed the final DS-QoL measure, which consisted of 20 items in three domains. The completion rate for items was 99%. "Floor and ceiling effects" ranged from 0-19%. Construct validity was good with significant correlation between 2 domains and 2 items on the PedsQL. Reliability was excellent, with Cronbach's alpha coefficient ranging from 0.78-0.93.
  
  
  CONCLUSIONS
  This DS-QoL measure is appropriate for use in children with achalasia and has shown good results in this validation study. Further work in higher numbers is necessary to determine discriminant validity and test-retest reliability.
authors.affiliation: Chelsea and Westminster Hospital, Department of Paediatric Gastroenterology, London, United Kingdom. mm1305@ic.ac.uk
authors.forename: M
authors.initials: M
authors.lastname: Marlais
authors.forename: J R
authors.initials: JR
authors.lastname: Fishman
authors.forename: D J
authors.initials: DJ
authors.lastname: Rawat
authors.forename: M
authors.initials: M
authors.lastname: Haddad
mesh_terms: D000293:Adolescent; D002648:Child; D004931:Esophageal Achalasia / Q000175:diagnosis* / Q000523:psychology*; D005260:Female; D006801:Humans; D008297:Male; D011788:Quality of Life; D015203:Reproducibility of Results; D011795:Surveys and Questionnaires; D054928:Validation Studies as Topic