Development and evaluation of the Digit Triplet Test in Swahili language
Background: The development of a Digit Triplet Test in the Swahili language is an essential step towards providing accurate hearing assessment for Swahili-speaking populations. Objectives: This study aimed to develop a Digit Triplet Test in Swahili through a two-part procedure consisting of an opti...
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| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
AOSIS
2025-02-01
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| Series: | South African Journal of Communication Disorders |
| Subjects: | |
| Online Access: | https://sajcd.org.za/index.php/sajcd/article/view/1090 |
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| Summary: | Background: The development of a Digit Triplet Test in the Swahili language is an essential step towards providing accurate hearing assessment for Swahili-speaking populations.
Objectives: This study aimed to develop a Digit Triplet Test in Swahili through a two-part procedure consisting of an optimisation phase and an evaluation phase using normal hearing participants.
Method: A total of 34 subjects participated in the study. During the optimisation phase, a psychometric intelligibility function was determined for each recorded digit, allowing for volume adjustments to standardise the threshold across all digits. This resulted in a lower threshold and a steeper psychometric function for both the triplets and the test lists. Using the optimised speech material, four test lists were created, each containing 27 triplets composed of digits between 1 and 9. The finalised material was then evaluated.
Results: In the final version, the mean Speech Reception Threshold (SRT) for the participants was −8.9 ± 0.6 dB Signal-to-Noise Ratio (SNR), and the mean slope was 24.7 ± 3.5%/dB using triplet scoring.
Conclusion: The psychometric function for normal listeners shows a steep slope with little variation between subjects and across test lists.
Contribution: The test results are comparable to those of Digit Triplet Tests developed in other languages, indicating the effectiveness and reliability of the Swahili Digit Triplet Test for hearing assessments. |
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| ISSN: | 0379-8046 2225-4765 |