title: Construct validity of a new rating scale for self-reported impairments in persons with late effects of polio.
abstract: OBJECTIVE
  To evaluate the construct validity of a new rating scale for self-reported impairments in persons with late effects of polio.
  
  
  METHODS
  Psychometric analysis of data on self-perceived impairments in persons with prior polio.
  
  
  METHODS
  Two hundred seventy-three persons with prior polio (119 men and 154 women; mean age, 63.5 years).
  
  
  METHODS
  Rasch analysis of a 13-item rating scale with 5 response categories, in which the participants rated how much they have been bothered by various post-polio-related impairments during the past 2 weeks.
  
  
  RESULTS
  The initial analysis showed disordered categories, misfit with some of the items, multidimensionality, and local dependency. After adjustment of the categories, which resulted in a 4-category rating scale, fit to the model was achieved, but the scale still showed signs of multidimensionality. Analyses of local dependency revealed correlations among some of the items, which resulted in a 5 testlet solution, which gave fit to the model and unidimensionality.
  
  
  CONCLUSIONS
  After adjustment of the categories and local dependency, this new rating scale, Self-Reported Impairments in Persons With Late Effects of Polio, can be considered as unidimensional. The good psychometric properties implies that the Self-Reported Impairments in Persons With Late Effects of Polio scale could be a useful rating scale that would increase our understanding of the impairments that persons with late effects of polio can experience. With further refinements, this scale may assist in the planning and evaluation of appropriate rehabilitation interventions.
authors.affiliation: Department of Health Sciences, Lund University, Lund, Sweden. christina.brogardh@med.lu.se
authors.forename: Christina
authors.initials: C
authors.lastname: Brogårdh
authors.forename: Jan
authors.initials: J
authors.lastname: Lexell
authors.forename: Asa
authors.initials: A
authors.lastname: Lundgren-Nilsson
mesh_terms: D018771:Arthralgia / Q000503:physiopathology; D001288:Attention / Q000502:physiology; D004185:Disability Evaluation; D004417:Dyspnea / Q000503:physiopathology; D005221:Fatigue / Q000503:physiopathology; D005260:Female; D006801:Humans; D008297:Male; D008569:Memory Disorders / Q000503:physiopathology; D008875:Middle Aged; D019964:Mood Disorders / Q000523:psychology; D018763:Muscle Fatigue / Q000502:physiology; D018908:Muscle Weakness / Q000503:physiopathology; D011051:Poliomyelitis / Q000503:physiopathology* / Q000523:psychology; D025341:Principal Component Analysis; D057566:Self Report