Zhang Gong, Qi Li, Wang Yonghua
School of Speech and Audiology, Zhejiang Chinese Medical University, Hangzhou 310053, China.
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Zhonghua Er Bi Yan Hou Tou Jing Wai Ke Za Zhi. 2014 Sep;49(9):765-8.
A pilot study found the masking level difference (MLD) normal value of Chinese aged from 10 to 40, served to clinical practice.
Seventy-three normal persons with hearing threshold < 20 dB and no disorder of otology were divided into three groups: classified 10-20 age as A group, 21-30 age as B group, 31-40 age as C group. MLD of age, gender and race were determined by the audiometer with dual channel by playing audio test disc. Same tests were compared with English language.
The mean value of MLD in Chinese was (11.1 ± 3.4) dB and the 95% normal reference values were between 4.4 to 17.8 dB . There was no difference in term of gender. The value of MLD increased with age. In the term of language, foreign showed high value of MLD than that of Chinese.
The measuring of MLD depends on age and language but not depends on gender. The normal threshold of MLD depends on age and language should be measured when normal values were applied to assess MLD in clinical practice.
一项初步研究得出了10至40岁中国人的掩蔽级差（MLD）正常值，以应用于临床实践。
将73名听力阈值<20dB且无耳科疾病的正常人分为三组：10至20岁为A组，21至30岁为B组，31至40岁为C组。通过播放音频测试碟片，使用双通道听力计测定年龄、性别和种族的MLD。并与英语进行相同测试。
中国人MLD的平均值为（11.1±3.4）dB，95%正常参考值在4.4至17.8dB之间。性别方面无差异。MLD值随年龄增加。在语言方面，外语的MLD值高于中文。
MLD的测量取决于年龄和语言，而非性别。在临床实践中应用正常值评估MLD时，应测量取决于年龄和语言的MLD正常阈值。
