title: Mayo-Portland adaptability inventory: comparing psychometrics in cerebrovascular accident to traumatic brain injury.
abstract: OBJECTIVE
  (1) To evaluate the measurement reliability and construct validity of the Mayo-Portland Adaptability Inventory, 4th revision (MPAI-4) in a sample consisting exclusively of patients with cerebrovascular accident (CVA) using single parameter (Rasch) item-response methods; (2) to examine the differential item functioning (DIF) by sex within the CVA population; and (3) to examine DIF and differential test functioning (DTF) across traumatic brain injury (TBI) and CVA samples.
  
  
  METHODS
  Retrospective psychometric analysis of rating scale data.
  
  
  METHODS
  Home- and community-based brain injury rehabilitation program.
  
  
  METHODS
  Individuals post-CVA (n=861) and individuals with TBI (n=603).
  
  
  METHODS
  Not applicable.
  
  
  METHODS
  MPAI-4.
  
  
  RESULTS
  Item data on admission to community-based rehabilitation were submitted to Rasch, DIF, and DTF analyses. The final calibration in the CVA sample revealed satisfactory reliability/separation for persons (.91/3.16) and items (1.00/23.64). DIF showed that items for pain, anger, audition, and memory were associated with higher levels of disability for CVA than TBI patients; whereas, self-care, mobility, and use of hands indicated greater overall disability for TBI patients. DTF analyses showed a high degree of association between the 2 sets of items (R=.92; R(2)=.85) and, at most, a 3.7 point difference in raw scores.
  
  
  CONCLUSIONS
  The MPAI-4 demonstrates satisfactory psychometric properties for use with individuals with CVA applying for interdisciplinary posthospital rehabilitation. DIF reveals clinically meaningful differences between CVA and TBI groups that should be considered in results at the item and subscale level.
authors: Department of Physical Medicine and Rehabilitation, Indiana University School of Medicine, Indianapolis, IN 46254, USA. jmalec@rhin.com
authors: James F
authors: JF
authors: Malec
authors: Jacob
authors: J
authors: Kean
authors: Irwin M
authors: IM
authors: Altman
authors: Shannon
authors: S
authors: Swick
mesh_terms: D000328:Adult; D001930:Brain Injuries / Q000523:psychology* / Q000534:rehabilitation; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D051346:Mobility Limitation; D026741:Physical Therapy Modalities; D011594:Psychometrics; D015203:Reproducibility of Results; D012189:Retrospective Studies; D012648:Self Care / Q000523:psychology; D020521:Stroke / Q000523:psychology*; D000071939:Stroke Rehabilitation