title: Six patient-reported outcome measurement information system short form measures have negligible age- or diagnosis-related differential item functioning in individuals with disabilities.
abstract: OBJECTIVE
  To evaluate the measurement invariance of 6 self-report measures selected for an ongoing longitudinal study of individuals with spinal cord injury, muscular dystrophy, postpolio syndrome, and multiple sclerosis.
  
  
  METHODS
  Participants completed and returned by mail surveys that included the targeted self-report measures. Ordinal logistic regressions methods were applied to evaluate items for differential item functioning (DIF) by diagnosis and age range.
  
  
  METHODS
  Community.
  
  
  METHODS
  Participants (N=2479) who had 1 of the 4 target diagnoses.
  
  
  METHODS
  None.
  
  
  METHODS
  Six short-form measures from the Patient-Reported Outcome Measurement Information System (PROMIS) were administered to participants to measure fatigue, pain interference, satisfaction with social roles, sleep disturbance, sleep-related impairment, and depression.
  
  
  RESULTS
  One item of 1 measure (fatigue) exhibited DIF by diagnosis based on a published standard for meaningful DIF. However, scores corrected for this DIF were highly correlated with uncorrected scores (r>.999). No DIF by age range was found for any of the measures.
  
  
  CONCLUSIONS
  Study findings support the use of the selected PROMIS short forms for comparing symptoms and quality of life indicators across different diagnoses and age ranges.
authors.affiliation: Department of Medical Social Sciences, Northwestern University, Chicago, IL. Rodney.lipishan@albertahealthservices.ca
authors.forename: Karon F
authors.initials: KF
authors.lastname: Cook
authors.forename: Alyssa M
authors.initials: AM
authors.lastname: Bamer
authors.forename: Dagmar
authors.initials: D
authors.lastname: Amtmann
authors.forename: Ivan R
authors.initials: IR
authors.lastname: Molton
authors.forename: Mark P
authors.initials: MP
authors.lastname: Jensen
mesh_terms: D000203:Activities of Daily Living; D000328:Adult; D000367:Age Factors; D000368:Aged; D003430:Cross-Sectional Studies; D003863:Depression / Q000175:diagnosis / Q000453:epidemiology; D004185:Disability Evaluation; D006233:Persons with Disabilities / Q000534:rehabilitation*; D005221:Fatigue / Q000175:diagnosis / Q000453:epidemiology; D005260:Female; D006801:Humans; D007398:Interpersonal Relations; D016015:Logistic Models; D008297:Male; D008875:Middle Aged; D017063:Outcome Assessment, Health Care; D011594:Psychometrics; D011788:Quality of Life; D018570:Risk Assessment; D012647:Self-Assessment; D018434:Sickness Impact Profile; D012893:Sleep Wake Disorders / Q000175:diagnosis / Q000453:epidemiology; D011795:Surveys and Questionnaires; D014481:United States