The development and evaluation of the Finnish digit triplet test

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Willberg , T , Buschermoehle , M , Sivonen , V , Aarnisalo , A A , Lopponen , H , Kollmeier , B & Dietz , A 2016 , ' The development and evaluation of the Finnish digit triplet test ' , Acta Oto-Laryngologica , vol. 136 , no. 10 , pp. 1035-1040 .

Title: The development and evaluation of the Finnish digit triplet test
Author: Willberg, Tytti; Buschermoehle, Michael; Sivonen, Ville; Aarnisalo, Antti A.; Lopponen, Heikki; Kollmeier, Birger; Dietz, Aarno
Contributor: University of Helsinki, Department of Ophthalmology and Otorhinolaryngology
University of Helsinki, Korva-, nenä- ja kurkkutautien klinikka
Date: 2016-10
Language: eng
Number of pages: 6
Belongs to series: Acta Oto-Laryngologica
ISSN: 0001-6489
Abstract: Objectives: The aim of the study was to develop a reliable and easily accessible screening test for primary detection of hearing impairment.Methods: Digits 0-9 were used to form quasirandom digit triplets. First, digit specific intelligibility functions and speech recognition thresholds (SRTs) were determined. To homogenize the test material digits with steep intelligibility function slopes were chosen and level correction up to 2dB were applied to the digits as needed. Evaluation measurements were performed to check for systematic differences in intelligibility between the test lists and to obtain normative reference function for normal-hearing listeners.Results: The mean SRT and the final slope of the test lists were -10.8 +/- 0.1dB signal-to-noise ratio (SNR) and 21.7 +/- 1.8%/dB, respectively (measurements at constant level; inter-list variability). The mean SRT and slope of the test subjects were -10.8 +/- 0.5dB SNR and 23.4 +/- 5.2%/dB (measurements at constant level; inter-subject variability). The mean SRT for normal-hearing young adults for a single adaptive measurement is -9.8 +/- 0.9dB SNR.Conclusion: The Finnish digit triplet test is the first self-screening hearing test in the Finnish language. It was developed according to current standards, and it provides reliable and internationally comparable speech intelligibility measurements.
Subject: Digit triplet test (DTT)
speech audiometry
speech test in noise
speech recognition threshold (SRT)
hearing screening
signal-to-noise ratio (SNR)
3125 Otorhinolaryngology, ophthalmology

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