[Calculation of percentage of hearing loss in speech audiometry]

In a previous paper the authors explained, based on statistical analysis, the use of mixed Czech verbal audiometry for the percentage evaluation of auditory losses. In the present work the above problems are discussed and an actual example of calculation of auditory losses is given. Based on statistical processing of more than 200 sound and verbal audiograms a table was prepared where the number is inserted corresponding to the sum of 50% and 100% comprehensibility of a mixed verbal set in dB. A reading of the percentage hearing loss is then taken. In case of discrimination loss in verbal audiometry its value is added to the sum of 50% and maximum attained comprehensibility. If the thus calculated percentage hearing loss in verbal audiometry differs from the hearing loss assessed according to Fowler and Sabine in sound audiometry, in the final evaluation the mean of the two percentage values is used.