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Developing the Communicative Participation Item Bank: Rasch Analysis Results From a Spasmodic Dysphonia Sample

Contact author: Carolyn R. Baylor, Department of Rehabilitation Medicine, University of Washington, Box 356490, Seattle, WA 98195. E-mail: cbaylor{at}u.washington.edu.

Purpose: 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.

Method: 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.

KEY WORDS: Rasch analyses, participation, spasmodic dysphonia

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