Quist-Hanssen S, Thorud E, Aasand G
Acta Otolaryngol Suppl. 1979;360:90-5. doi: 10.3109/00016487809123483.
Subjects suffering from noise-induced hearing loss (NIHL) with or without hearing loss at 2 kHz were examined by speech audiometry with a three-digit test, bisyllabic and monosyllabic PB word lists in silence, and in USASI noise with a masking effect of 44 dB and 68 dB at 1 kHz. Subjects with up to 20 dB hearing loss at 2 kHz had almost the same speech comprehension in noise as normal hearing subjects. Subjects with hearing loss greater than 20 dB at 2 kHz had increasing discrimination loss at increasing noise levels. They also needed a signal-to-noise ratio better than normal-hearing persons would yield at the noise levels used. The evaluation of hearing disablement in occupational noise-included hearing loss should therefore be based for one-half on the results of speech audiometry in silence, and for the other half, in noise.
对患有噪声性听力损失（NIHL）的受试者进行了言语测听检查，这些受试者在2kHz频率处有或无听力损失，使用三位数测试、双音节和单音节PB单词表在安静环境下进行，以及在美国标准大气噪声（USASI）中进行，该噪声在1kHz频率处的掩蔽效应为44dB和68dB。在2kHz频率处听力损失达20dB的受试者在噪声中的言语理解能力与听力正常的受试者几乎相同。在2kHz频率处听力损失大于20dB的受试者在噪声水平增加时辨别力损失也增加。在所用噪声水平下，他们还需要比听力正常者更好的信噪比。因此，对职业噪声引起的听力损伤（包括听力损失）的评估，一半应基于安静环境下的言语测听结果，另一半应基于噪声环境下的言语测听结果。
