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Updated: Aug 3, 2026
Systematic Hearing Performance Evaluation Process for Adolescents with Cochlear Implantation at Early Ages
Published on: March 24, 2023
Test-Retest Reliability Bounds for Consonant-Nucleus-Consonant Word and Phoneme Scores for Cochlear-Implant Users
Sandeep A Phatak1, Joshua G W Bernstein
1National Military Audiology and Speech Pathology Center, Walter Reed National Military Medical Center, Bethesda, Maryland, USA.
Objectives:
This report establishes test-retest 95% confidence interval bounds for consonant-vowel-consonant (CNC) word- and phoneme-recognition scores for cochlear-implant listeners.
Design:
Data from two published cochlear-implant studies were analyzed. Across-list SDs for individual subjects were compared with the expected SD for a binomially distributed variable. The model was adjusted by tuning the effective binomial distribution set size to minimize the root-mean-square deviation from measured SDs.
Results:
The effective CNC-word set size equaled the number of words per list (50). The effective phoneme set size (approximately 100) was lower than the number of phonemes per list (150).
Conclusions:
Results support the hypotheses that individual CNC words are recognized independently, and that there is mutual information across phonemes, resulting in a smaller effective set size. A table of confidence intervals and critical-difference values for CNC word and phoneme recognition is provided.
