Chung D Y, Gannon R P
J Am Aud Soc. 1979 Jul-Aug;5(1):11-6.
Two groups of subjects with normal hearing and three groups of subjects with noise-induced hearing loss were studied for the effect of ear protectors on word discrimination in two different speech-to-noise ratios. Various interactions in the analyses of variance were shown to be significant. The important demonstration in this study is that at high speech intensity, subjects with normal hearing should obtain higher word discrimination score with ear protectors than without if the signal-to-noise ratio is high. Albeit, the same is not true for a low signal-to-noise ratio, for a low speech intensity, or when subjects have hearing losses; the improvements in these conditions are not high enough to warrant the disuse of ear protectors. Results are discussed and compared with other studies.
对两组听力正常的受试者和三组噪声性听力损失受试者进行了研究，以考察在两种不同的言语噪声比条件下，耳塞对言语辨别力的影响。方差分析中的各种交互作用显示具有显著性。本研究的重要发现是，在高言语强度下，如果信噪比高，听力正常的受试者佩戴耳塞时的言语辨别得分应高于不佩戴耳塞时。然而，对于低信噪比、低言语强度或受试者存在听力损失的情况则并非如此；在这些情况下的改善程度不足以保证不使用耳塞。对结果进行了讨论，并与其他研究进行了比较。
