Intrajudge and Interjudge Reliability of the Stuttering Severity Instrument–Fourth Edition Purpose The Stuttering Severity Instrument (SSI) is a tool used to measure the severity of stuttering. Previous versions of the instrument have known limitations (e.g., Lewis, 1995). The present study examined the intra- and interjudge reliability of the newest version, the Stuttering Severity Instrument–Fourth Edition (SSI-4) (Riley, 2009). ... Research Article
Newly Published
Research Article  |   August 25, 2017
Intrajudge and Interjudge Reliability of the Stuttering Severity Instrument–Fourth Edition
 
Author Affiliations & Notes
  • Jason H. Davidow
    Hofstra University, Hempstead, NY
  • Kathleen A. Scott
    Hofstra University, Hempstead, NY
  • Jason H. Davidow and Kathleen A. Scott contributed equally to this article.
    Jason H. Davidow and Kathleen A. Scott contributed equally to this article.×
  • Disclosure: The authors have declared that no competing interests existed at the time of publication.
    Disclosure: The authors have declared that no competing interests existed at the time of publication. ×
  • Correspondence to Jason H. Davidow: jason.davidow@hofstra.edu
  • Editor: Krista Wilkinson
    Editor: Krista Wilkinson×
  • Associate Editor: Shelley Brundage
    Associate Editor: Shelley Brundage×
Article Information
Speech, Voice & Prosodic Disorders / Fluency Disorders / Research Issues, Methods & Evidence-Based Practice / Newly Published / Research Article
Research Article   |   August 25, 2017
Intrajudge and Interjudge Reliability of the Stuttering Severity Instrument–Fourth Edition
American Journal of Speech-Language Pathology, Newly Published. doi:10.1044/2017_AJSLP-16-0079
History: Received May 13, 2016 , Revised December 27, 2016 , Accepted April 11, 2017
 
American Journal of Speech-Language Pathology, Newly Published. doi:10.1044/2017_AJSLP-16-0079
History: Received May 13, 2016; Revised December 27, 2016; Accepted April 11, 2017

Purpose The Stuttering Severity Instrument (SSI) is a tool used to measure the severity of stuttering. Previous versions of the instrument have known limitations (e.g., Lewis, 1995). The present study examined the intra- and interjudge reliability of the newest version, the Stuttering Severity Instrument–Fourth Edition (SSI-4) (Riley, 2009).

Method Twelve judges who were trained on the SSI-4 protocol participated. Judges collected SSI-4 data while viewing 4 videos of adults who stutter at Time 1 and 4 weeks later at Time 2. Data were analyzed for intra- and interjudge reliability of the SSI-4 subscores (for Frequency, Duration, and Physical Concomitants), total score, and final severity rating.

Results Intra- and interjudge reliability across the subscores and total score concurred with the manual's reported reliability when reliability was calculated using the methods described in the manual. New calculations of judge agreement produced different values from those in the manual—for the 3 subscores, total score, and final severity rating—and provided data absent from the manual.

Conclusions Clinicians and researchers who use the SSI-4 should carefully consider the limitations of the instrument. Investigation into the multitasking demands of the instrument may provide information on whether separating the collection of data for specific variables will improve intra- and interjudge reliability of those variables.

Acknowledgment
This research was supported by a Hofstra University grant awarded to Jason H. Davidow.
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