title: Difference in method of administration did not significantly impact item response: an IRT-based analysis from the Patient-Reported Outcomes Measurement Information System (PROMIS) initiative.
abstract: OBJECTIVE
  To test the impact of method of administration (MOA) on the measurement characteristics of items developed in the Patient-Reported Outcomes Measurement Information System (PROMIS).
  
  
  METHODS
  Two non-overlapping parallel 8-item forms from each of three PROMIS domains (physical function, fatigue, and depression) were completed by 923 adults (age 18-89) with chronic obstructive pulmonary disease, depression, or rheumatoid arthritis. In a randomized cross-over design, subjects answered one form by interactive voice response (IVR) technology, paper questionnaire (PQ), personal digital assistant (PDA), or personal computer (PC) on the Internet, and a second form by PC, in the same administration. Structural invariance, equivalence of item responses, and measurement precision were evaluated using confirmatory factor analysis and item response theory methods.
  
  
  RESULTS
  Multigroup confirmatory factor analysis supported equivalence of factor structure across MOA. Analyses by item response theory found no differences in item location parameters and strongly supported the equivalence of scores across MOA.
  
  
  CONCLUSIONS
  We found no statistically or clinically significant differences in score levels in IVR, PQ, or PDA administration as compared to PC. Availability of large item response theory-calibrated PROMIS item banks allowed for innovations in study design and analysis.
authors.affiliation: QualityMetric, Lincoln, RI, USA, jbj@nrcwe.dk.
authors.forename: Jakob B
authors.initials: JB
authors.lastname: Bjorner
authors.forename: Matthias
authors.initials: M
authors.lastname: Rose
authors.forename: Barbara
authors.initials: B
authors.lastname: Gandek
authors.forename: Arthur A
authors.initials: AA
authors.lastname: Stone
authors.forename: Doerte U
authors.initials: DU
authors.lastname: Junghaenel
authors.forename: John E
authors.initials: JE
authors.lastname: Ware
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001172:Arthritis, Rheumatoid / Q000175:diagnosis / Q000523:psychology; D018592:Cross-Over Studies; D003625:Data Collection / Q000379:methods*; D003866:Depressive Disorder / Q000175:diagnosis / Q000523:psychology; D004192:Discrimination, Psychological; D005260:Female; D006801:Humans; D007256:Information Systems; D008297:Male; D008875:Middle Aged; D017063:Outcome Assessment, Health Care; D029424:Pulmonary Disease, Chronic Obstructive / Q000175:diagnosis / Q000523:psychology; D011788:Quality of Life; D057566:Self Report; D018434:Sickness Impact Profile; D011795:Surveys and Questionnaires; D055815:Young Adult