title: Developing the communicative participation item bank: Rasch analysis results from a spasmodic dysphonia sample.
abstract: OBJECTIVE
  The purpose of this study was to conduct the initial psychometric analyses of the Communicative Participation Item Bank-a new self-report instrument designed to measure the extent to which communication disorders interfere with communicative participation. This item bank is intended for community-dwelling adults across a range of communication disorders.
  
  
  METHODS
  A set of 141 candidate items was administered to 208 adults with spasmodic dysphonia. Participants rated the extent to which their condition interfered with participation in various speaking communication situations. Questionnaires were administered online or in a paper version per participant preference. Participants also completed the Voice Handicap Index (B. H. Jacobson et al., 1997) and a demographic questionnaire. Rasch analyses were conducted using Winsteps software (J. M. Linacre, 1991).
  
  
  RESULTS
  The results show that items functioned better when the 5-category response format was recoded to a 4-category format. After removing 8 items that did not fit the Rasch model, the remaining 133 items demonstrated strong evidence of sufficient unidimensionality, with the model accounting for 89.3% of variance. Item location values ranged from -2.73 to 2.20 logits.
  
  
  CONCLUSIONS
  Preliminary Rasch analyses of the Communicative Participation Item Bank show strong psychometric properties. Further testing in populations with other communication disorders is needed.
authors.affiliation: Department of Rehabilitation Medicine, University of Washington, Seattle, WA, USA. cbaylor@u.washington.edu
authors.forename: Carolyn R
authors.initials: CR
authors.lastname: Baylor
authors.forename: Kathryn M
authors.initials: KM
authors.lastname: Yorkston
authors.forename: Tanya L
authors.initials: TL
authors.lastname: Eadie
authors.forename: Robert M
authors.initials: RM
authors.lastname: Miller
authors.forename: Dagmar
authors.initials: D
authors.lastname: Amtmann
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D003144:Communication Barriers; D016208:Databases, Factual; D055154:Dysphonia / Q000175:diagnosis* / Q000503:physiopathology*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D011571:Psychoacoustics; D012720:Severity of Illness Index; D011795:Surveys and Questionnaires