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Figure 5. Percentage of 18 year olds with high frequency (3 to 8 kHz) threshold shifts > 20 dB. Results of preventive care examinations of recruits in the Norwegian army in the year 1981 until 1992.

Figure 5. Percentage of 18 year olds with high frequency (3 to 8 kHz) threshold shifts > 20 dB. Results
of preventive care examinations of recruits in the Norwegian army in the year 1981 until 1992.