Abstract
The audiogram patterns of 64 deaf sibling pairs (128 patients), one of whom visited the Visual and Auditory Research Institute of Fukuoka Medical Association in the past five years and who could undergo audiometric tests were investigated. The following results were obtained.
1. Most of the 29 pairs of congenital profound deafness, both of whom showed only residual hearing acuity in low tones, were found to have consancuineous parents.
2. Relatively severe hearing loss was found in most of the patients. Nine of 10 pairs of whom both showed similar severity of hearing loss were cases of severe hearing loss. In these cases, the elder sibling usually showed more a profound hearing loss.
3. Regarding the types of audiograms, gradual high tone loss and scale out were found frequently.
4. Similarity of right and left audiograms was found in 69.9% of the patients.
5. Two out of three pairs of identical twins showed similar audiogram types, but different severity of hearing loss.
