The first part. We have considered in view of the present circumstances of our country that proper criteria for deafness were hearing loss of 25 db or more at any two frequencies or 30 db or more at any single frequency among 6 octave band frequencies of 500-8000 cps.
Examining 1528 audiograms obtained from the patients treated in our clinic complaining of deafness, tinnitus and vertigo, we tried to find efficiencies of the screenings by various standards. It was discovered that sceening by 20 db tone of 1000 and 4000 cps was justifiable.
The second part. We had screening tests of 3946 pupils, grades 1-6, of H. and M. primary schools in Fukuoka city. We then had hearing tests of 862 pupils, arbitrarily selected from among them, in a sound-proof room. The results was shown in Table 8.
Column A shows the percentages of the ears passing the screening test and having normal hearing. Column B shows those of the ears passing the screening test but having deafness. Column C shows those of the ears failing in the screening test but having normal hearing. Column D shows those of the ears failing in the screening test and having deafness.
In column B pupils 4-6 grades have obviously higher percentages than pupils 1-3 grades.
We are not certain why the percentages in column C fluctuate through the grades. Generally high percentages in column C seem to suggest the necessity of rescreening the ears failing in the screening tests.
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