Among 30 BTE hearing aid users, average hearing loss at 500, 1 000, 2 000 and 4 000 Hz, was also less than 85 dB, and the patients were aged from 16 to 60 years.

• 30例(耳)使用耳背式助听器耳聋患者中；平均听力损失(500；1000；2000；4000Hz)<85dB；年龄16-60岁。