Speech Disability Percentage Calculator: Our Speech Disability Percentage Calculator simplifies combining SIA and OVCA scores into one clear disability percentage. Instead of manual lookup tables and error‑prone calculations, you’ll get instant results backed by standardized norms.
Speech Disability Percentage Calculator
1. Speech Intelligibility Test (SIA)
| Score | Description | SIA (%) |
|---|---|---|
| 1 | Normal | 0 – 15 |
| 2 | Can understand without difficulty; however, feel speech is normal | 16 – 30 |
| 3 | Can understand with little effort, occasionally need to ask for repetition | 31 – 39 |
| 4 | Can be understood with concentration and effort, especially by a sympathetic listener | 40 – 55 |
| 5 | Can understand with difficulty and concentration by family, but not others | 56 – 75 |
| 6 | Can understand with effort if the content is known | 76 – 89 |
| 7 | Cannot understand at all even when content is known | 90 – 100 |
2. Voice Test (OVCA)
| Score | OVCA (%) |
|---|---|
| 1 | 0 – 15 |
| 2 | 16 – 30 |
| 3 | 31 – 39 |
| 4 | 40 – 55 |
| 5 | 56 – 75 |
| 6 | 76 – 89 |
| 7 | 90 – 100 |
Speech Disability Percentage Calculation Method
Speech Disability Percentage Calculation is done in three parts:
- Speech Intelligibility Test
- Voice Test
- Speech Disability Certificate Percentage Calculation
Formula for Speech Disability Certificate Percentage Calculation:
Percentage of speech Disability = [(2 × Upper range of percentage of SIA) + Upper range of percentage of OVCA] ÷ 3
This is the weighted contribution of SIA and OVCA to the overall voice clarity percentage. This assessment will quantify perceived disability based on perceptual and voice intelligibility judgments.
Application Developed by Vikash Kumar (aslpweb.com)
Step-by-Step Guide to Using the Calculator
- Open the Speech Disability Percentage Calculator on your device.
- Under “Speech Intelligibility Test,” choose the score that best matches your patient’s performance. E.g., Score 4 if they require significant listener effort.
- Under “Voice Test,” choose the corresponding OVCA score. For a moderately rough and breathy voice, you might choose Score 5.
- Click “Calculate Disability Percentage.”
- The tool applies the certified formula (explained in Section 3) and displays the final percentage.
- Use this percentage to complete a Speech Disability Certificate or tailor a treatment plan.
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