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Figure 3. Annual decline of pure tone thresholds in dB from age 70 to age 75, men left ear (the Gothenburg gerontological and geriatric population study) for men exposed to occupation noise (15 years or more) and those not exposed to occupational noise. The deterioration of hearing was more pronounced for the noise exposed individuals at frequencies outside the typical noise frequencies, especially 2 kHz, compared with those not exposed to noise.

Figure 3. Annual decline of pure tone thresholds in dB from age 70 to age 75, men left ear (the
Gothenburg gerontological and geriatric population study) for men exposed to occupation noise (15
years or more) and those not exposed to occupational noise. The deterioration of hearing was more pronounced
for the noise exposed individuals at frequencies outside the typical noise frequencies, especially
2 kHz, compared with those not exposed to noise.