Speech and Language Disability Percentage Calculation: “Speech and language disability” means a permanent disability arising from conditions such as laryngectomy or aphasia affecting one or more components of speech and language due to organic or neurological causes.
The Speech and Language disability percentage is determined based on various factors, including the severity of the speech and language disability, Speech Intelligibility Affected (SIA), Overall Voice Clarity Affected (OVCA), and Western Aphasia Battery (WAB).
To obtain an accurate speech and language disability percentage, it is important to consult with the relevant authorities or healthcare professionals like Speech and Language Pathologist or Speech Therapist. They will guide the assessment process and the specific factors considered when determining the speech and language disability percentage to obtain a speech and language disability certificate.
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Speech and Language Disability Certificate
A speech and language disability certificate are an official document that certifies an individual’s speech and language disability status. The disability percentage plays a crucial role in the disability certificate as it quantifies the extent of the individual’s disability. Here’s how the speech and language disability percentage calculation is typically used in a disability certificate.
Types of Speech and Language Disability Certificate
There are two types of certificate issue in speech and language disability:
- Speech Disability Certificate
- Language Disability Certificate
Speech Disability Certificate
For speech disability certificate, there should be such conditions or diseases that affect speech intelligibility and voice quality. Conditions affecting Speech Components for which Speech Disability certificate can be issued:
- Laryngectomy
- Glossectomy
- Bilateral vocal cord paralysis
- Maxillofacial anomalies
- Dysarthria
- Apraxia of Speech
Language Disability Certificate
For a Language disability certificate, only one condition or disorder should be affected by Language components. Conditions affecting Language Components for which Language Disability certificate can be issued
- Aphasia
Speech and Language Disability Percentage Calculation
Speech Language Pathologist or Speech Therapist does the speech and language disability calculations. Speech Disability Certificates and Language Disability Certificates are issued separately that’s why the percentage calculation of both is also done separately.
- Speech Disability Percentage Calculation
- Language Disability Percentage Calculation
Speech Disability Percentage Calculation
Speech Disability Percentage Calculation is done in three parts:
- Speech Intelligibility Test
- Voice Test
- Speech Disability Certificate Percentage Calculation
Speech Intelligibility Test for Speech Disability Percentage Speech Disability
Standardized Tests used for measuring Percentage of Speech Intelligibility Affects (SIA)
- Perceptual Speech intelligibility rating scale (AYJNISHD, 2003) or
- Perceptual Rating Scale (SRMC, Chennai)
It is recommended to assess a person’s verbal output using either the Perceptual Speech Intelligibility Rating Scale (AYJNISHD, 2003) or the Perceptual Rating Scale (SRMC, Chennai), with the percentage of Speech Intelligibility Affected (SIA) to be measured based on score as stated below:
| Score | Percentage of Speech Intelligibility Affects (SIA) |
| 1 | 0 – 15 |
| 2 | 16 – 30 |
| 3 | 31 – 39 |
| 4 | 40 – 55 |
| 5 | 56 – 75 |
| 6 | 76 – 89 |
| 7 | 90 – 100 |
Voice Test for Speech Disability Percentage Speech Disability
Standardized Tests used for measuring Percentage of Overall Voice Clarity Affected (OVCA)
- Consensus Auditory Perceptual Evaluation of Voice (CAPE-V)
- Dysphonia Severity Index (DSI)
The Consensus Auditory Perceptual Evaluation of Voice (CAPE-V) or Dysphonia Severity Index (DSI) can be employed to assess the percentage of Overall Voice Clarity Affected (OVCA), encompassing factors such as roughness, breathiness, strain, pitch, and loudness. The average score should be assigned with consideration for the weighted impact on the overall voice clarity percentage.
| Score | Percentage of Overall voice clarity affected (OVCA) |
| 1 | 0 – 15 |
| 2 | 16 – 30 |
| 3 | 31 – 39 |
| 4 | 40 – 55 |
| 5 | 56 – 75 |
| 6 | 76 – 89 |
| 7 | 90 – 100 |
Formula for Speech Disability Certificate Percentage Calculation
The formula appears to be related to calculating the percentage of speech disability, and it involves the upper range values of two factors: percentage of SIA (Speech Intelligibility Assessment) and percentage of OVCA (Oral Verbal Communication Assessment).
Percentage of speech Disability = [(2 x Upper range of percentage of SIA) + Upper range of percentage of OVCA] ÷ 3
The process for assessing speech disability involves utilizing standardized tests to measure the percentage of Speech Intelligibility Affected (SIA) and Overall Voice Clarity Affected (OVCA). Two recommended scales for assessing SIA are the Perceptual Speech Intelligibility Rating Scale (AYJNISHD, 2003) and the Perceptual Rating Scale (SRMC, Chennai). For OVCA, the Consensus Auditory Perceptual Evaluation of Voice (CAPE-V) and Dysphonia Severity Index (DSI) are recommended.
To calculate the Percentage of Speech Disability, a formula is proposed: [(2 x Upper range of percentage of SIA) + Upper range of percentage of OVCA] ÷ 3. This formula considers the weighted impact of SIA and OVCA on overall voice clarity percentage. The assessment aims to provide a quantitative measure of speech disability based on perceptual and voice clarity evaluations.
Language Disability Percentage Calculation
The sole criterion for calculating the percentage of language disability is Aphasia. To assess the disability percentage for aphasia, the Western Aphasia Battery (WAB) is employed. In Indian languages, the administration of the Western Aphasia Battery (WAB) is recommended six months after the onset of a stroke, and the Aphasia Quotient (AQ) is then calculated following standard procedures by a Speech-Language Pathologist.
Procedure of Language Disability Percentage Calculation
The Language Disability percentage can be calculated by referring to the provided reference chart. Simply find the intersection point of the tens digit and unit digit in the WAB score. For instance, with an AQ of 56, locating the value where 5 (tens digit column) intersects with 6 (unit digit row) results in 40, indicating a Language Disability percentage of 40%.
| Number in Tens Place in WAB Score | Number in Unit Place in WAB Score | |||||||||
| 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | |
| 0 | 100 | 98.9 | 97.8 | 96.8 | 95.7 | 94.6 | 93.6 | 92.5 | 91.4 | 90.4 |
| 1 | 89.3 | 88.2 | 87.2 | 86.1 | 85.0 | 84.0 | 82.9 | 81.8 | 80.8 | 79.7 |
| 2 | 78.6 | 77.6 | 76.5 | 75.4 | 74.4 | 73.3 | 72.2 | 71.2 | 70.1 | 69.0 |
| 3 | 68.0 | 66.9 | 65.8 | 64.8 | 63.7 | 62.6 | 61.6 | 60.5 | 59.4 | 58.4 |
| 4 | 57.3 | 56.2 | 55.2 | 54.1 | 53.0 | 52.0 | 50.9 | 49.8 | 48.8 | 47.7 |
| 5 | 46.6 | 45.6 | 44.5 | 43.4 | 42.4 | 41.3 | 40.0 | 39.2 | 38.1 | 37.1 |
| 6 | 36.0 | 34.9 | 33.9 | 32.8 | 31.7 | 30.7 | 29.6 | 28.5 | 27.5 | 26.4 |
| 7 | 25.3 | 24.3 | 23.2 | 22.1 | 21.1 | 20 | 18.9 | 17.9 | 16.8 | 15.7 |
| 8 | 14.7 | 13.6 | 12.5 | 11.5 | 10.4 | 09.3 | 08.3 | 07.2 | 06.1 | 05.1 |
| 9 | 4.0 | 2.9 | 2.9 | 0.8 | 00.0 | 00.0 | 00.0 | 00.0 | 00.0 | 00.0 |
Medical Authority for Speech and Language Disability Certificate
The head of the certification medical authority for the certification of hearing disability, speech, and language disability shall be the Medical Superintendent, Chief Medical Officer, Civil Surgeon, or any other equivalent authority designated by the State Government.
The certification medical authority will consist of:
(i) Medical Superintendent, Chief Medical Officer, Civil Surgeon, or equivalent authority
(ii) ENT Specialist
(iii) One specialist (audiologist/speech-language pathologist) appointed by the Medical Superintendent, Chief Medical Officer, Civil Surgeon, or equivalent authority as specified by the State Government.
FAQs about Speech and Language Disability Percentage Calculation
1. What is a Speech and Language Disability Percentage, and how is it calculated?
Speech and language disability percentage refers to the extent of impairment in speech and language due to conditions like laryngectomy or aphasia. It is calculated based on factors such as Speech Intelligibility Affected (SIA) and Overall Voice Clarity Affected (OVCA) using standardized tests recommended by professionals.
2. How is the Speech Disability Certificate different from the Language Disability Certificate?
The Speech Disability Certificate is issued for conditions affecting speech intelligibility and voice quality, such as laryngectomy or dysarthria. The Language Disability Certificate, on the other hand, is issued for conditions affecting language components, primarily aphasia.
3. Who determines the Speech and Language Disability Percentage, and why is it important?
Speech and Language Pathologists or Speech Therapists determine the disability percentage. It’s crucial for obtaining a speech and language disability certificate, officially certifying an individual’s disability status.
4. What tests are used for calculating Speech Disability Percentage, and what do they measure?
Tests like the Perceptual Speech Intelligibility Rating Scale and Voice Clarity tests (CAPE-V, DSI) are used. They assess Speech Intelligibility Affected (SIA) and Overall Voice Clarity Affected (OVCA) to determine the Speech Disability Percentage.
5. How is the Language Disability Percentage calculated, and what factors are considered?
Language Disability Percentage is calculated using the Western Aphasia Battery (WAB) for aphasia conditions. The procedure involves referring to a chart to find the intersection point of the WAB score, determining the Language Disability Percentage.
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