The authors studied hearing acuity of school children in secluded parts of Hokuriku District,
1. Of 1, 431 school children studied, hard of hearing was found in 81 children or 5.7 per cent.
2. No significant difference was seen in different age groups.
3. Most of them had low grade hearing loss not exceeding 30 db. Severe hearing loss more than 50 db. was seen in three or 0.21 per cent.
4. Among the hard of hearing children, sensorineural type of hearing loss was seen in 58.0 per cent, conductive type in 14.3 per cent, and combined type in 27.7 per cent.
5. 54.3 per cent of hard of hearing children were not aware of their hearing impairment.
6. A relation was seen between the extent of hearing impairment and the school records.
7. A positive relation was confirmed between adenoid vegetation and hearing impairment.