Grades of hearing impairment (WHO1997).

Name: Grades of hearing impairment (WHO1997).
Published: 2014-02-21T00:00:00+08:00

数据链接：

官方服务：

资源简介：

Grades 2 to 4 are classified as disabling hearing impairment. The audiometric ISO values are averages of values at 500, 1000, 2000, 4000 Hz.

创建时间：

2014-02-21