The rate of high-frequency hearing loss among automobile factory workers in China may be very high. A Chinese study in an automobile factory showed a prevalence of high-frequency hearing loss of 17.2% among the participants.
In the study, gender, age, smoking and noise were influencing factors for high-frequency hearing loss.
More specifically, the study found that being male and being 30 years or older were risk factors for a high-frequency hearing loss. Smoking and noise exposure were also found to be risk factors.
In the study, noise levels ranged from 75.0 dB(A) to 92.0 dB(A), with an average of 84 dB(A).
The study, "Investigation on high-frequency hearing loss of noise workers in an automobile factory", examined 2,647 workers in an automobile factory in China.