Stuttering Severity (%SS) Bands — Printable Cheatsheet
Printable reference of the Guitar (2019) percent-syllables-stuttered severity bands with referral thresholds and clinical interpretation notes.
Overview
Percent syllables stuttered (%SS) is the most commonly reported fluency metric in US school SLP practice, and the Guitar (2019) severity bands are the most widely cited reference for classifying the resulting number as mild, moderate, or severe. The bands are deceptively simple on paper — under 3%, 3–5%, 5–10%, over 10% — but clinicians routinely misapply them because the sample type, the syllable count, and the inclusion of secondary behaviours all change the number. This cheatsheet is the one-page printable the clinician pulls out during a fluency intake.
This cheatsheet is a static reference intended for clinical and educational use. Every page is rendered from a peer-reviewed source and cited below the printable sheet. Clinicians must adapt to the individual patient and to the current edition of any cited instrument manual before clinical use.
How to use this sheet
Collect a 300–600 syllable conversational speech sample (not a reading sample — the Guitar bands are specifically normed on connected conversational speech). Count stuttered syllables using the Yairi & Ambrose (2005) definition of a stuttering-like disfluency (SLD): part-word repetition, monosyllabic whole-word repetition, audible or silent prolongation, or block. Divide stuttered syllables by total syllables, multiply by 100, and find the resulting %SS on this cheatsheet. Report the severity band verbatim in the IEP present levels, along with the sample size and the decision rule you used to score SLDs — this triplet is what will hold up in a due-process review. Do not use %SS as a standalone referral criterion: always pair it with a Stuttering Severity Instrument-4 (SSI-4) overall score and a parent/teacher concern rating.
“A preschooler at 4.2%SS on a 600-syllable sample is not the same clinical picture as a first-grader at 4.2%SS — the preschool sample might still be developmental disfluency, while the school-age sample is more likely true stuttering. Always report age and duration alongside %SS.”
Automate this workflow
Stop hand-copying the stuttering %ss numbers into every report
Upload the session audio and ConductSpeech extracts the metrics, formats them against the published norm band, and drops a ready-to-paste present levels paragraph next to the cheatsheet values. Built for school-based SLPs on 50-student caseloads.
Printable sheet
| %SS band | Severity | Clinical interpretation | Referral flag |
|---|---|---|---|
| <3% | Not stuttering / typical disfluency | Within normal-disfluency range; may reflect typical developmental repetitions. | Monitor; no referral absent parent concern |
| 3 – 5% | Mild stuttering | Above typical disfluency; noticeable but does not substantially interfere with communication. | Refer for full fluency evaluation |
| 5 – 10% | Moderate stuttering | Clear disfluency with occasional secondary behaviours; communication is disrupted. | Refer; begin intervention planning |
| >10% | Severe stuttering | Frequent and long stuttering events, often with avoidance and tension; major impact on communication. | Immediate referral; intensive intervention |
Guitar (2019) severity bands for percent syllables stuttered in conversational speech. Apply to 300–600 syllable samples using SLD scoring per Yairi & Ambrose (2005).
Common pitfalls
- Scoring a reading sample instead of a conversation sample. The Guitar bands are calibrated to connected conversational speech and over-report severity on reading samples.
- Including normal disfluencies (whole-sentence revisions, filled pauses) in the stuttered syllable count. Only SLDs per Yairi & Ambrose (2005) belong in the numerator.
- Running the calculation on fewer than 300 syllables. Small samples produce unstable %SS estimates and are easy to dispute in a due-process review.
- Treating %SS as a diagnosis. It is one data point — pair it with SSI-4, secondary-behaviour observation, and a concern rating before writing an eligibility statement.
Free tools paired with this cheatsheet
Stuttering Frequency Calculator
Free interactive percent syllables stuttered (%SS) calculator for speech-language pathologists. Enter stuttered syllables and total syllables from a 300- to 600-syllable conversational speech sample and get the %SS plus the Guitar (2019) clinical severity band (not stuttering, mild, moderate, severe). Built for SLP fluency intake, IEP eligibility, preschool stuttering screening, treatment-progress tracking, and graduate fluency-assessment training. Mobile-friendly, client-side, no sign-up.
Open toolCaseload Workload Calculator
Free interactive caseload workload calculator for school-based speech-language pathologists implementing the ASHA Workload Approach (ASHA 2002 Workload Analysis Technical Report; ASHA 2024 School-Based Service Delivery Practice Portal). Enter the number of students on your caseload by service intensity tier (consult, mild 30-60 min/week, moderate 60-90, severe 90-150, profound 120-240), plus annual counts of initial, triennial, and dismissal evaluations, IEP / IFSP / 504 meetings, parent conferences, and weekly travel, supervision, and professional-development minutes, and the calculator returns the total weekly workload in hours, a breakdown across seven ASHA workload categories (direct service, indirect documentation, evaluations, meetings, travel, supervision, PD), and a capacity flag (under, ok, at-capacity, over) against the 37.5-hour FTE baseline. Built for school SLPs, special-education coordinators, district SLP leads, CF-SLPs, and state school SLP association advocacy. Mobile-friendly, client-side, no sign-up.
Open toolIEP Goal Generator
Free interactive IEP (Individualised Education Programme) goal generator for school-based speech-language pathologists, special-education teachers, and IEP teams. Pick the goal area (one of the eight ASHA School-Based Service Delivery areas: articulation, expressive language, receptive language, fluency, voice, pragmatics / social communication, AAC, literacy), pick the target skill from the curated bank of 30+ starter skills, enter the baseline percent and the target percent, set the consecutive-sessions mastery criterion and the annual-review deadline, and the tool drafts a SMART (Specific, Measurable, Achievable, Relevant, Time-bound) IEP goal sentence ready to paste into the IEP. Includes a SMART self-check rubric, a customisable condition clause, a copy-to-clipboard button, and suggested baseline / target ranges that match published school-age SLP intervention practice. Mobile-friendly, client-side, no sign-up.
Open toolRelated cheatsheets
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References
- Guitar, B. (2019). Stuttering: An Integrated Approach to Its Nature and Treatment (5th ed.). Wolters Kluwer.
- Yairi, E., & Ambrose, N. (2005). Early Childhood Stuttering: For Clinicians by Clinicians. Pro-Ed.
- Riley, G. D. (2009). Stuttering Severity Instrument, Fourth Edition (SSI-4). Pro-Ed.
- Bloodstein, O., Bernstein Ratner, N., & Brundage, S. (2021). A Handbook on Stuttering (7th ed.). Plural Publishing.