Change in noise exposure over time
Table 2 displays the noise exposure experience for the 60 volunteers
who had completed at least six months of downloading of exposure
data. The median number of download events per month for these
workers was 15 (range 1 – 30). These individuals, over the six month
observation period, demonstrated a mean slope of decline in their
daily noise exposure (for ‘ at ear ’ noise exposures) of 1.3 dBA/year
(median 2.5 dBA/year).