RESULTS OF THE WORLD'S FAIR HEARING TESTS 537 



TABLE 1 

 Hearing Loss for Each Step in the Musical Tone Test 



* These tones were used in the instructions for the test. 



The voltage levels used at each frequency in the hearing test were 

 selected so that the average young person would be able to hear the 

 tones on the first six or seven steps, but would miss the last two 

 or three. 



Relation of Hearing to Age and Sex 



The relation of hearing loss to age and sex may be summarized by 

 giving the average hearing loss. More detailed information may be 

 obtained from tables giving the frequencies of occurrence of different 

 amounts of hearing loss. In this section, both types of data are given 

 for men and women separately, in five age ranges. 



Trends in Average Hearing 

 Average hearing as indicated by the mean hearing loss for men and 

 women in five different age groups is shown in Table 2. The number 



TABLE 2 

 Mean Hearing Loss in db 



