Pupils with impairment of hearing in the primary schools in Osaka City were examined and results obtained were as follows.
(1) By screening test with audiometer or by the hearing test with whispering method, 1, 098 pupils with impairment of hearing out of 50, 496 persons (2.2percent) were found.
(2) After the screening test of audiometer, the clinical oto-rhinological examination was carried out, and as a result 442 pupils described above out of 35, 757 persons (1.2 percent) were found.
(3) In both examinations, it was recognized that the main cause of impairment of hearing was chronic medial otitis.
