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Publication Detail
Test-retest reliability of the Toy Discrimination Test with a masker of noise or babble in children with hearing impairment
  • Publication Type:
    Journal article
  • Publication Sub Type:
    Article
  • Authors:
    Lovett R, Summerfield Q, Vickers D
  • Journal:
    International Journal of Audiology
  • Keywords:
    Reliability, speech perception, children, hearing impairment
  • Addresses:
    UCL Ear Institute
    332-336 Gray's Inn Road
    London
    WC1X 8EE

    University of York
    York
Abstract
Objective: The Toy Discrimination Test measures children ’ s ability to discriminate spoken words. Previous assessments of reliability tested children with normal hearing or mild hearing impairment, and most studies used a version of the test without a masking sound. We assessed test-retest reliability for children with hearing impairment using maskers of broadband noise and two-talker babble. Design: Stimuli were presented from a loudspeaker. The signal-to-noise ratio (SNR) was varied adaptively to estimate the speech-reception threshold (SRT) corresponding to 70.7% correct performance. Participants completed each masked condition twice. Study sample: Fifty-fi ve children with permanent hearing impairment participated, aged 3.0 to 6.3 years. Thirty-four children used acoustic hearing aids; 21 children used cochlear implants. Results: For the noise masker, the within-subject standard deviation of SRTs was 2.4 dB, and the correlation between fi rst and second SRT was 0.73. For the babble masker, corresponding values were 2.7 dB and 0.60. Reliability was similar for children with hearing aids and children with cochlear implants. Conclusions: The results can inform the interpretation of scores from individual children. If a child completes a condition twice in different listening situations (e.g. aided and unaided), a difference between scores 7.5 dB would be statistically signifi cant (p .05).
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