The true statement about deafness in the case of alpo syndrome is:

Deafness in alpo syndrome: 1. High-tone sensorineural deafness occurs in 55-83% of males 2. Deafness is never congenital 3. Always accompanied by renal impairment 4. The hearing defect is clinically apparent at an average age of 11 years 5. Deafness is slowly progressive in childhood, but usually static in adult life Audiometry reveals a bilateral reduction in sensitivity to tones in the 2,000-8,000 Hz range (high-tone) Ref: Dan Med Bull 2009;56:105-52