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Validity and Reliability of the Stuttering Severity Instrument-Fourth Edition for School-Aged Children and Adult
Mazin T Alqhazo1, Tha'er Al-Kadi2, Firas S Alfwaress1
1Department of Rehabilitation Sciences, Faculty of Applied Medical Sciences, Jordan University of Science and Technology, Irbid.
Purpose:
The Stuttering Severity Instrument-Fourth Edition (SSI-4) is unavailable in Arabic language. The purpose of the current research is to translate the SSI-4 (Riley, 2009) into Arabic and to discuss its validity, as well as its intrajudge and interjudge reliability.
Method:
Archived videos of 28 school-aged children who stutter ranged in age from 8 to 16 years (M = 10.5, SD = 3.5) and 11 adults who stutter ranged in age from 19 to 22 years (M = 20.4, SD = 0.9) were assessed using a translated version of the SSI-4 by 10 graduate students in speech-language pathology. The 10 raters evaluated the speech samples for the cases using the translated versions at Time 1 and Time 2 (2 weeks apart). The validity of the scale was assessed using Pearson correlation coefficients, while intrajudge and interjudge reliability was assessed using intraclass correlation coefficients.
Results:
The results showed that the subscales of the SSI (frequency, duration, and physical features) were valid items. For reliability, the results revealed that the interjudge reliability values for both school-aged children and adults who stutter in all the items of the scale were less than 80%, whereas the intrajudge agreement was higher than 80% for all the items of the SSI-4 for both children and adults.
Conclusion:
In conclusion, the Arabic version of SSI-4 requires more data to assess its reliability before recommending its clinical use in Arabic-speaking communities.
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