Article  |   October 2009
Developing the Communicative Participation Item Bank: Rasch Analysis Results From a Spasmodic Dysphonia Sample
 
Author Affiliations & Notes
  • Carolyn R. Baylor
    University of Washington, Seattle
  • Kathryn M. Yorkston
    University of Washington, Seattle
  • Tanya L. Eadie
    University of Washington, Seattle
  • Robert M. Miller
    University of Washington, Seattle
  • Dagmar Amtmann
    University of Washington, Seattle
  • Contact author: Carolyn R. Baylor, Department of Rehabilitation Medicine, University of Washington, Box 356490, Seattle, WA 98195. E-mail: cbaylor@u.washington.edu.
Article Information
Speech, Voice & Prosodic Disorders / Voice Disorders / Language Disorders / Speech
Article   |   October 2009
Developing the Communicative Participation Item Bank: Rasch Analysis Results From a Spasmodic Dysphonia Sample
Journal of Speech, Language, and Hearing Research, October 2009, Vol. 52, 1302-1320. doi:10.1044/1092-4388(2009/07-0275)
History: Received December 18, 2007 , Accepted January 7, 2009
 
Journal of Speech, Language, and Hearing Research, October 2009, Vol. 52, 1302-1320. doi:10.1044/1092-4388(2009/07-0275)
History: Received December 18, 2007; Accepted January 7, 2009
Web of Science® Times Cited: 8

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.

Acknowledgments
This project was funded by National Institutes of Health (NIH) Planning Grant 1R21 HD 45882-01, with additional technical support from personnel at the University of Washington Center on Outcomes Research in Rehabilitation funded by NIH Patient-Reported Outcomes Measurement Information System (PROMIS) Grant 5U01AR052171-03. We wish to express appreciation to all of the participants who volunteered their time to this project and who have been so willing to share their experiences with us. We also wish to thank the staff, clinicians, and researchers associated with the University of Washington Medical Center Voice Clinic, the National Spasmodic Dysphonia Association, and the American Speech-Language-Hearing Association Special Interest Division 3 Voice listserv, who helped us with participant recruitment. There are too many of you to thank individually here, but your contributions are appreciated. The contributions of Jean Deitz and Brian Dudgeon—members of the development team for the CPIB—are gratefully acknowledged, as are the contributions of Karon Cook for input on statistical analyses. Thank you to Jody Guariz and Ashlie Stegeman for help with data entry.
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