3.2.1 The severity of hearing loss
Among the 10 patients, the severity of hearing loss of the affected ear was characterized as mild in 2 ears (20%), moderate in 1 ear (10%), severe in 4 ears (40%), profound in 1 ear (10%) and deafness in 1 ear (10%). In addition, one patient present normal hearing threshold at frequencies of 0.25, 0.5, 1 and 2 kHz, 45 dB hearing loss in 4 kHz. The PTA ranged from 18.75 dB to 120 dB, with a mean range of 60.75 ± 30.39 dB.