Table 6 : Noise Induced Hearing Loss (NIHL) predicted from ISO 1999 as a function of noise exposure level for 3 years (adapted from Lutman et al. 2008) Extent of hearing loss to be expected from a shorter exposure duration of 3 years at daily continuous noise levels of 80, 85, 90 and 95 dB(A).

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Table 6 : Noise Induced Hearing Loss (NIHL) predicted from ISO 1999 as a function of noise exposure level for 3 years
(adapted from Lutman et al. 2008)

Extent of hearing loss to be expected from a shorter exposure duration of 3 years at daily continuous noise levels of 80, 85, 90 and 95 dB(A).
NIHL at 4 kHz in dB	Daily noise level in dB(A)
The values are for hearing loss at 4 kHz, which is the frequency predicted to give the greatest hearing loss. Values are given for the median, and the 5^th centile (value exceeded by 5% of the population).
NIHL at 4 kHz in dB	80	85	90	95
Median	0.7	2.9	6.5	11.6
5^th centile	1.0	3.8	8.4	15.0

Hearing loss after 3 years of exposure is less likely than after 45 years. However the proportion is greater than simply dividing the amount of hearing loss pro rata. To a rough approximation, the magnitude of NIHL after 3 years is 43% of the NIHL after 45 years.

Source: SCENIHR, Potential health risks of exposure to noise from personal music players and mobile phones including a music playing function (2008) , Section 3.5.3., Page 28.


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