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Development and evaluation of the Digit Triplet Test in Swahili language
Bjørn G Rosendahl1, Tron V Tronstad, Jon Øygarden
1Department of Ear, Nose and Throat, Head and Neck Surgery, Lovisenberg Diaconal Hospital, Oslo, Norway; and, Department of Special Needs Education, Faculty of Educational Sciences, University of Oslo, Oslo. bjorngjessing@hotmail.com.
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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