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).