Erlandsson B, Håkanson H, Ivarsson A, Nilsson P
Scand Audiol. 1980;9(4):215-21. doi: 10.3109/01050398009076356.
The hearing thresholds of shipyard workers have been measured with a Békésy sweep audiometer. The number of employees at different workplaces is so large that it is possible to select groups of workers of specified ages who have been employed by the shipyard for many years. These workers have used either earplugs of earmuffs for 5--10 years and have also been working all the time in almost the same noise environment. Three ways of investigation have been used to observe differences in the hearing levels between 'plug-men' and 'muff-men'. All three show a greater hearing impairment for 'muff-men' than for 'plug-men'. Under certain conditions earplugs provide the most effective protection although the attenuation is higher for earmuffs than for earplugs.
已使用贝凯西扫描听力计测量了造船厂工人的听力阈值。不同工作场所的员工数量众多，因此有可能挑选出已在造船厂工作多年的特定年龄段的工人群体。这些工人使用耳塞或耳罩已有5至10年，并且几乎一直在相同的噪声环境中工作。已采用三种调查方法来观察“戴耳塞者”和“戴耳罩者”之间听力水平的差异。所有三种方法都表明，“戴耳罩者”的听力损伤比“戴耳塞者”更大。在某些情况下，尽管耳罩的衰减比耳塞更高，但耳塞能提供最有效的保护。
