title: The PedsQL: reliability and validity of the short-form generic core scales and Asthma Module.
abstract: OBJECTIVE
  We sought to assess the reliability and validity of the PedsQL 4.0 SF15, a shortened version of the 23-item PedsQL 4.0 Generic Core Scales, which is a pediatric health-related quality of life (HRQoL) instrument, and the PedsQL 3.0 SF22 Asthma Module, a short-form of the PedsQL 3.0 Asthma Module.
  
  
  METHODS
  The PedsQL 4.0 SF15 and the PedsQL 3.0 SF22 Asthma Module were administered by telephone to 125 adolescents (aged 12-18) and 338 parents of children with asthma (aged 2-11). Healthy (n = 451) and chronically ill (n = 422) children, matched by age, respondent status, and ethnicity to the asthma sample, provided data for selected validity tests.
  
  
  RESULTS
  The Total Score from the PedsQL 4.0 SF15 and the Asthma Symptoms scale and Treatment Problems scale from the PedsQL 3.0 SF22 Asthma Module were sufficiently reliable for group comparisons (alpha > or = 0.70 across all age groups) in the asthma sample. The PedsQL 4.0 SF15 and the PedsQL 3.0 SF22 Asthma Module were able to distinguish between children of different clinical status and correlated as expected with measures of productivity and family functioning in the asthma sample. The psychometric properties of the PedsQL 4.0 SF15 were generally comparable to those of the original instrument.
  
  
  CONCLUSIONS
  The Total Score of the PedsQL 4.0 SF15 and the Asthma Symptoms scale of the PedsQL 3.0 SF22 Asthma Module demonstrated the best reliability and validity and should be suitable for group-level comparisons of generic and asthma-specific HRQoL in clinical research studies of children with asthma.
authors.affiliation: RAND Corporation, Health Program, Santa Monica, California, USA. kchan@jhsph.edu
authors.forename: Kitty S
authors.initials: KS
authors.lastname: Chan
authors.forename: Rita
authors.initials: R
authors.lastname: Mangione-Smith
authors.forename: Tasha M
authors.initials: TM
authors.lastname: Burwinkle
authors.forename: Mayde
authors.initials: M
authors.lastname: Rosen
authors.forename: James W
authors.initials: JW
authors.lastname: Varni
mesh_terms: D000293:Adolescent; D001249:Asthma / Q000503:physiopathology*; D002648:Child; D017281:Cost of Illness; D019988:Children with Disabilities; D005195:Family Relations; D005260:Female; D006801:Humans; D008297:Male; D010290:Parents / Q000523:psychology; D011594:Psychometrics / Q000295:instrumentation*; D011788:Quality of Life; D012650:Self Disclosure; D012720:Severity of Illness Index; D018434:Sickness Impact Profile; D011795:Surveys and Questionnaires