Thelin J W, Joseph D J, Davis W E, Baker D E, Hosokawa M C
Public Health Rep. 1983 May-Jun;98(3):268-73.
Farmers are exposed to noise that is potentially hazardous to hearing. We measured the hearing of 161 male farmers and 75 male nonfarmers at the 1979 Missouri Farmers Association Agri-Fair and compared it with the hearing of 129 office workers from central Missouri. Fixed-level screening tests were conducted in both ears at three stimulus frequencies: 1000 and 2000 hertz at 20 decibels hearing level and 4000 hertz at 25 decibels hearing level. Audiometers were calibrated in accordance with the ANSI-1969 standard. The results show that farmers are at risk for hearing loss at 2000 and 4000 hertz when compared with office workers. The prevalence of hearing loss was greater for farmers at both frequencies in every decade age group from 25 to 64 years. Using screening failure at 2000 and 4000 hertz in both ears as a criterion for a loss that would affect communication ability, we found that the failure rate was 16.8 percent for farmers and 6.2 percent for office workers. As other investigators have found, the prevalence of high-frequency hearing loss in male nonfarmers who associate with farmers was nearly as great as for farmers.
农民接触到的噪音可能会对听力造成危害。1979年，我们在密苏里州农民协会农业展览会上对161名男性农民和75名男性非农民的听力进行了测量，并将其与来自密苏里州中部的129名办公室职员的听力进行了比较。在三个刺激频率下对双耳进行固定水平筛查测试：听力水平为20分贝时的1000赫兹和2000赫兹，以及听力水平为25分贝时的4000赫兹。听力计按照ANSI - 1969标准进行校准。结果显示，与办公室职员相比，农民在2000赫兹和4000赫兹时存在听力损失风险。在25至64岁的每个十年年龄组中，农民在这两个频率的听力损失患病率都更高。以双耳在2000赫兹和4000赫兹时筛查未通过作为会影响沟通能力的听力损失标准，我们发现农民的未通过率为16.8%，办公室职员为6.2%。正如其他研究人员所发现的，与农民交往的男性非农民中高频听力损失的患病率几乎与农民一样高。
