|Year : 2013 | Volume
| Issue : 3 | Page : 202-206
Development of an Arabic speech intelligibility test for children
Samia E. Bassiouny1, Mona A. Hegazi1, Jilan F. Nassar1, Mohsen A. Ibrahim2, Aml S. Saber1, Ahmed Abdel Hamid1
1 Unit of Phoniatrics, Department of Otolaryngology, Faculty of Medicine, Ain Shams University, Cairo, Egypt
2 Department of Psychometry, Faculty of Arts, El Minya University, El Minya, Egypt
|Date of Submission||09-Mar-2013|
|Date of Acceptance||07-Mar-2013|
|Date of Web Publication||11-Jun-2014|
Jilan F. Nassar
MD, Unit of phoniatrics, Department of Otolaryngology, Faculty of Medicine, Ain Shams University, Cairo
Source of Support: None, Conflict of Interest: None
Speech intelligibility is usually expressed as a percentage of spoken words, sentences, or phonemes correctly identified by a listener or a group of listeners when spoken by a talker or a number of talkers. Communicative disorders could have a deleterious effect on speech intelligibility. To date, there are no Arabic tests measuring speech intelligibility.
It is necessary to develop and standardize an objective Arabic speech intelligibility test that can be used to estimate the degree of deterioration of speech intelligibility in communicative disorders as an attempt to develop a valid and a reliable tool to assess the efficacy of different therapy programs for different communicative disorders.
Patients and methods
This study was carried out on 200 children with an age range of 4–12 years whose language skills were either fully developed or equivalent for age. All children were selected randomly from the outpatient clinic of phoniatrics and had any of five selected speech disorders affecting speech intelligibility. Each child included in the study was subjected to two evaluations: a subjective rating of the child’s speech intelligibility and the developed Arabic speech intelligibility test, which is meant to be an objective measure.
The results showed a highly significant correlation between the scores of the Arabic speech intelligibility test and the average scores given by raters, the average scores for words, and the average scores for sentences (0.92, 0.98, and 0.84, respectively).
The developed test is proven to be valid and reliable for measuring speech intelligibility in children and could be categorically classified according to ranges of severity.
Keywords: Arabic test, communicative disorders, objective, rating, reliability, speech intelligibility, validity
|How to cite this article:|
Bassiouny SE, Hegazi MA, Nassar JF, Ibrahim MA, Saber AS, Hamid AA. Development of an Arabic speech intelligibility test for children. Egypt J Otolaryngol 2013;29:202-6
|How to cite this URL:|
Bassiouny SE, Hegazi MA, Nassar JF, Ibrahim MA, Saber AS, Hamid AA. Development of an Arabic speech intelligibility test for children. Egypt J Otolaryngol [serial online] 2013 [cited 2020 Sep 21];29:202-6. Available from: http://www.ejo.eg.net/text.asp?2013/29/3/202/134176
| Introduction|| |
Speech intelligibility is defined as the degree to which the acoustical signal is understood by a listener. Speech intelligibility is usually expressed as a percentage of words, sentences, or phonemes correctly identified by a listener or a group of listeners when spoken by a talker or a number of talkers 1.
Speech intelligibility is affected by: the experience of the listener, the context in which the sentence was spoken, the visibility of the speaker, the phonological and syntactic difficulty of the material spoken, and the familiarity of the speaker with the material spoken. Monsen 2 discussed the magnitude of these influencing factors on speech intelligibility. He considered the listener’s experience as the best known factor that can influence the intelligibility of speech.
Yorkston et al. 3 considered intelligibility to be the cumulative effect of the impairment and any compensatory strategies. Many communicative disorders have a deleterious effect on intelligibility.
Paralytic dysphonia 4, spasmodic dysphonia 5, and alaryngeal communication 6 are vocal disorders that may affect speech intelligibility. Fluency disorders such as stuttering 7 and cluttering 8 and impaired resonance 9 and motor speech disorders such as dysarthria (DYS) 10 and apraxia 11 are among the speech disorders that might impair speech intelligibility. In delayed language development 7 and dysphasia 12, speech intelligibility may also be affected.
An accurate estimation of speech intelligibility using an objective tool is important because it is one of the outcomes of therapy against communicative disorders. Improvement of speech intelligibility may sometimes be a unique goal in the treatment of some of these disorders such as DYS or alaryngeal speech.
| Patients and methods|| |
This study was carried out on 200 children within an age range of 4–12 years. All children were randomly selected from the outpatient clinic of phoniatrics and had any of the following disorders: developmental phonological disorders, hearing impairment, velopharyngeal incompetence, disfluency disorders, and DYS.
These disorders were included because they are known to have a negative impact on the degree of speech intelligibility. Any child within the age range of 4–12 years whose language skills were either fully developed or equivalent for age (evidenced by a language test) and who had average intelligence quotient was included in the study. Any child whose language was considered delayed for age or who had a visual perception problem was excluded from the study.
| Methods|| |
Each child included in the study was subjected to two evaluations:
Subjective rating of the child’s speech intelligibility
This was done by three individuals, including the clinician (phoniatrician) (D) and two outsiders who were not familiar with the child (r1, r2). The outsiders were neither phoniatricians nor logopedists, and thus the element of past experience with the child’s speech and the nature of the disorder was excluded. After establishing rapport with the clinician, the child was asked to talk about a certain topic or activity and discuss it. Thereafter, the two external raters were admitted to the room and allowed to listen to the child’s speech without prior knowledge about the topic the child was discussing about. All three raters were asked to rate for the child’s intelligibility along a five-point scale 13.
Thereafter, the clinician administered the test to the child, which is a mixed word and sentence intelligibility test. The test is considered as a modified version of The CID Picture SPINE test 14.
This Arabic speech intelligibility test is meant to be an objective measure. The test is composed of 100 cards carrying 50 pictures (each picture is repeated twice). The pictures are structurally organized into three sets as follows:
- Set A includes 20 pictures of monosyllabic words that start with: bilabial, nasal, epicodental, and supra-alveolar consonants.
- Set B includes 20 pictures of monosyllabic words that start with: dorsopalatal, uvular, velar, and pharyngeal consonants.
- Set C includes 10 pictures indicating simple action-verb sentences.
The pictures of each set are shuffled carefully and presented one by one to the child who is asked to name what is in the picture. Thereafter, the clinician will write down what he heard from the child in the clinician response form. The Arabic speech intelligibility test is designed to provide an estimation of the overall speech intelligibility of children by providing a total score in terms of percentage.
The child’s task is to say the pictured word correctly enough that the listener can decide which word, among the 20 or 10 possible choices, he/she was trying to say. Although the examiner knows the set of 20 (or 10 in sentences) possibilities, the examiner does not know which word the child will try to say on any given test item. Therefore, the examiner does not have to evaluate how a word was said but only whether the quality of articulation was functionally good enough to make the word understandable.
A sample of 30 children within the same age group range of 4–12 years was tested using the Arabic speech intelligibility test and then retested with the same test after an interval of 3 weeks. A correlation between the results of both tests was calculated using the κ-test for agreement, and the results indicated a highly significant correlation and reliability of the test.
| Results|| |
The distribution of the children as per the five disorders affecting speech intelligibility was as follows: 96 children with developmental phonological disorders, 33 children with hearing impairment, 34 children with velopharyngeal incompetence, 29 children with stuttering, and eight children with DYS.
The scores of all three raters showed a highly significant correlation. The average value represents the subjective score [Table 1].
[Table 2] shows the correlation between the mean score of the Arabic speech intelligibility test and that of the subjective test for all patients according to the disorder.
|Table 2: Correlation between the subjective scores and the Arabic test scores according to disorders|
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The correlation proved to be highly significant (P<0.01), with the highest correlation obtained in the age group of 10–12 years, followed by the age group of 7–9 years and then the age group of 4–6 years [Table 3]. [Table 3] shows correlation between the two test scores in the three age groups.
|Table 3: Correlation between the percentage scores of the Arabic intelligibility test and the mean values given by the raters according to age|
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Test reliability was measured by the test–retest method, which used the ‘Kappa test for agreement’, and the scores obtained from 30 children after a 3-week interval are shown in [Table 4]. The results of the κ-test for agreement for test and retest of 30 patients indicated a highly significant correlation between the results of the test and retest (P<0.01) for all items assessed.
[Table 5] shows the correlation between the total score of the Arabic speech intelligibility test and the average score given by raters, the average scores for words, and the average scores for sentences.
|Table 5: Correlation between the total score of the Arabic speech intelligibility test and the average score given by the raters, the average scores for words, and the average scores for sentences|
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The results showed that:
- The correlation between the total score of the Arabic intelligibility test and the subjective score (average score given by raters) is highly significant.
- The correlation between the total score of the Arabic intelligibility test and that for words is highly significant.
- The correlation between the total score of the Arabic intelligibility test and that for sentences is highly significant.
The highly significant correlation between the scores of the Arabic speech intelligibility test and the subjective test scores (which indicate different severity levels of speech intelligibility) allows the final intelligibility scores of the test to be revealed (if desired) in a categorical classification as shown in [Table 6] and [Figure 1].
|Figure 1: The categorical values of the Arabic speech intelligibility test.|
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| Discussion|| |
This study presents a design of an objective intelligibility test that can be used for Arabic speaking children in the age range of 4–12 years. This Arabic speech intelligibility test is meant to provide an estimation of the overall speech intelligibility of children. The following are the characteristics of the Arabic speech intelligibility test, which make it ideally suited for clinical use in children with impaired speech:
- It is easy and practical to administer.
- It is reliable from test to retest.
- It provides a quantitative index of how intelligible a child’s speech is in common communication disorders. It also provides a categorical value of speech intelligibility.
For determining the reliability of this test, the test–retest method was used because the most obvious method for finding the reliability of test scores is repeating the test on a second occasion 15.The reliability coefficient in this case is simply the correlation between the scores obtained by the same individual on the two administrations of the test. The reliability coefficient expresses the degree of consistency in measurement of the test scores. The reliability coefficient (r) ranges from 1.00 (indicating perfect reliability) to 0.00 (indicating absence of reliability) 16.
Lillvik et al. 17 in their study on normal speakers and speakers with different types and degrees of DYS assessed speech intelligibility by using qualitative (subjective) and quantitative (objective) measures; they found that the results of that assessment gave a reliable quantitative measure of word and sentence intelligibility in patients with dysarthric speech.
The validity is usually tested by comparing new test scores with previous test or tests scores measuring the same phenomenon. However, there are no Arabic tests measuring speech intelligibility. That is why the scores of the Arabic speech intelligibility test were correlated with those of the five-point scaling subjective test. The r value was 0.92, indicating that the Arabic speech intelligibility test is highly predictive of speech intelligibility. In their study, Beerends et al. 18 reported that there is a correlation between the objective and subjective tests of speech intelligibility of about 0.90 and recommended using objective tests as they are less time consuming compared with subjective tests.
In contrast, Monsen 19 after obtaining a correlation of 0.86 between the patients’ scores on the SPINE test and those obtained on an open-set sentence intelligibility test reported that the SPINE test is highly predictive of speech intelligibility.
According to Schiavetti 20, word identification tasks are considered valid and can be reliable. Validity of the Arabic speech intelligibility test can be assessed by several ways – by studying the total scores of the Arabic speech intelligibility test for correlation with the subjective score test (score given by raters) and by studying the total scores of the Arabic speech intelligibility test for correlation with its subtests (words and sentences). The results showed that:
- The correlation between the Arabic intelligibility test and the subjective score (score given by raters) is highly significant.
- The correlation between the Arabic intelligibility test score and those for words is highly significant.
- The correlation between the Arabic intelligibility test scores and those for sentences is highly significant.
The fact that the correlation produced highly significant results [Table 5] proves that the test is a valid measure of speech intelligibility.
Final test scoring
The Arabic speech intelligibility test provides the examiner with a final score in terms of percentage, which is meant to be an objective measure of a child’s speech intelligibility. This can be used for comparing speech intelligibility before and after intervention, and thus provides numerical values that can be used for statistical comparisons. On the basis of our results, the score may be changed into a categorical value of unintelligible speech (0–29%), poorly intelligible speech (30–50%), fairly intelligible speech (51–66%), good intelligibility (67–84%), and excellent intelligibility (85–100%).
Arabic speech intelligibility test
- It is proven to be valid and reliable.
- It can be readily used for children and adults who cannot read.
- It provides a percentage score that can be changed into a categorical score (% scores are important for research studies, whereas categorical scores are more clear to parents and families of speech disorder patients).
- It is easy to apply and is not time consuming.
- It does not need patient audio recordings.
- It does not need panels of listeners or listeners with very high linguistic abilities.
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[Table 1], [Table 2], [Table 3], [Table 4], [Table 5], [Table 6]