Reliability and Concurrent Validity of the Likert-Type Stuttering Severity Scale and the Visual Analog Scale in Turkish-Speaking Adults Who Stutter.

International journal of language & communication disorders · 2026 · Cohort · SLP
Ayşe İlayda Mutlu, İlkem Uçal

Trained speech-therapy students rated stuttering severity on a brief numerical scale and a 100-mm line, and both closely matched clinician SSI-4 scores. These quick tools could supplement detailed assessments in screening or research settings where time is limited.

Key findings

1

Both the 11-point numerical scale (0 to 10) and the 100-mm line showed excellent test-retest reliability, with ICCs of .997 and .987 respectively.

2

Inter-rater agreement was moderate for both tools: the VAS ICC was .656 and the SEV ICC was .573.

3

Both perceptual ratings correlated strongly with clinician SSI-4-TR scores: VAS r = .835 and SEV r = .814.

MethodologyResultsClinical Relevance

Single-blind randomized controlled trial. Sixty-four participants were randomized across two intervention arms and assessed at twelve weeks for the primary outcome…

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