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The number of subjects (not individual ears as with the previous analysis) with a significant threshold shift and no threshold shifts were counted.
The overall rate of significant threshold shifts recorded for personnel in the hearing-conservation program via the DOEHRS-HC (Defense Occupational and Environmental Health Readiness System-Hearing Conservation) database is approximately 15 percent, although significantly higher rates of reported hearing loss may exist in specific occupations.
Figure 1 shows that in 2003, the Fort Carson annual (permanent) significant threshold shift [a metric detailed on page 70] rate jumped from 12% to 16%.