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Normative data for the Maryland CNC Test.

Lisa Lucks Mendel¹, William D Mustain², Jessica Magro³

¹School of Communication Sciences and Disorders, University of Memphis, Memphis, TN.

Journal of the American Academy of Audiology

|November 8, 2014

Summary

This study provides normative data for the Maryland Consonant-Vowel Nucleus-Consonant (CNC) Test in veterans. Word-recognition scores decrease with increased hearing loss, offering audiologists a quantitative tool for interpretation.

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Area of Science:

Audiology
Speech Perception
Hearing Science

Background:

The Maryland Consonant-Vowel Nucleus-Consonant (CNC) Test is widely used in Veterans Administration medical centers.
There is a lack of published normative data for the Maryland CNC Test.

Purpose of the Study:

To establish normative data for word-recognition scores on the Maryland CNC Test.
To analyze these scores based on the degree of hearing loss in a veteran population.

Main Methods:

A retrospective descriptive study analyzed 1,760 veteran ears from Compensation and Pension examinations.
Pure-tone averages (PTA4) and maximum word-recognition scores (PBmax) using the Maryland CNC Test were documented.
Correlations between PBmax and PTA4 were analyzed.

Main Results:

A broad range of word-recognition scores were observed across all hearing loss levels.
A significant negative correlation was found between PBmax and PTA4.
Word-recognition scores declined notably with hearing loss exceeding mild levels.

Conclusions:

Normative data tables and figures are provided for audiologists interpreting Maryland CNC Test results in veterans.
This study offers a quantitative method for interpreting word-recognition scores relative to pure-tone hearing loss.