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Clinical and audiological studies of 234 Saudi patients from the central area of Saudi Arabia with progressive sensorineural hearing loss were carried out in Riyadh. One hundred and sixty-four came from 38 families, i.e. 70% of the total and 30% were sporadic cases. Consanguinity was found in 80.8%. Their hearing loss was characterized as being bilateral sensorineural, starting at 1 kHz frequency...