title: PROMIS® Parent Proxy Report Scales: an item response theory analysis of the parent proxy report item banks.
abstract: OBJECTIVE
  The objective of the present study is to describe the item response theory (IRT) analysis of the National Institutes of Health (NIH) Patient Reported Outcomes Measurement Information System (PROMIS(®)) pediatric parent proxy-report item banks and the measurement properties of the new PROMIS(®) Parent Proxy Report Scales for ages 8-17 years.
  
  
  METHODS
  Parent proxy-report items were written to parallel the pediatric self-report items. Test forms containing the items were completed by 1,548 parent-child pairs. CCFA and IRT analyses of scale dimensionality and item local dependence, and IRT analyses of differential item functioning were conducted.
  
  
  RESULTS
  Parent proxy-report item banks were developed and IRT parameters are provided. The recommended unidimensional short forms for the PROMIS(®) Parent Proxy Report Scales are item sets that are subsets of the pediatric self-report short forms, setting aside items for which parent responses exhibit local dependence. Parent proxy-report demonstrated moderate to low agreement with pediatric self-report.
  
  
  CONCLUSIONS
  The study provides initial calibrations of the PROMIS(®) parent proxy-report item banks and the creation of the PROMIS(®) Parent Proxy-Report Scales. It is anticipated that these new scales will have application for pediatric populations in which pediatric self-report is not feasible.
authors.affiliation: Department of Pediatrics, College of Medicine, Texas A&M University, 3137 TAMU, College Station, TX 77843-3137, USA. jvarni@arch.tamu.edu
authors.forename: James W
authors.initials: JW
authors.lastname: Varni
authors.forename: David
authors.initials: D
authors.lastname: Thissen
authors.forename: Brian D
authors.initials: BD
authors.lastname: Stucky
authors.forename: Yang
authors.initials: Y
authors.lastname: Liu
authors.forename: Hally
authors.initials: H
authors.lastname: Gorder
authors.forename: Debra E
authors.initials: DE
authors.lastname: Irwin
authors.forename: Esi Morgan
authors.initials: EM
authors.lastname: DeWitt
authors.forename: Jin-Shei
authors.initials: JS
authors.lastname: Lai
authors.forename: Dagmar
authors.initials: D
authors.lastname: Amtmann
authors.forename: Darren A
authors.initials: DA
authors.lastname: DeWalt
mesh_terms: D000293:Adolescent; D000328:Adult; D002138:Calibration; D002648:Child; D002908:Chronic Disease; D005260:Female; D006304:Health Status; D006801:Humans; D008297:Male; D008875:Middle Aged; D017063:Outcome Assessment, Health Care; D010045:Outpatients; D010290:Parents; D019727:Proxy; D011788:Quality of Life; D015203:Reproducibility of Results