Abstract
On hundred five children with bilateral perceptive hearing loss have been followed up a period of one half up to seven years from the first reliable test.
The reliability of hearing test to young, untrained hearing impaired children was about eighty five percent on each trial, so the test should be done at least four times to get reliable threshold.
Seventy of all did not differed their threshold even after two to seven years. But twenty eight showed progressivity of the hearing impairment. More than half of the reported hereditary or marriage in bleed showed spontaneous progresivity. Ten ears without hearing aid were getting worse threshold spontaneously.
Seven were from light hearing loss to moderate, two were light to severe, nineteen were from moderate to severe. Most of these cases deteriorated their hearing ability in all frequency, not only high tone but also low tone.
Seven cases improved their hearing slghtly in mainly low tone. These children had been treated with adenotomy, inflation of the eustachiantube, or ear drum massage. These suggested otological treatment improved the conductive hearing disturbance.
