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Figure 1: Mean tone thresholds in the morning before shooting for the control group (N=23, dashed lines) and for the NAC group (N=11, solid lines). Circles = right ear, crosses = left ear. Inter-individual standard deviations for the thresholds, varied between 5.3 and 11.2 dB in the control group, and between 5.8 and 13.8 dB in the NAC group

Figure 1: Mean tone thresholds in the morning before shooting for the control group (<i>N</i>=23, dashed lines) and for the NAC group (<i>N</i>=11, solid lines). Circles = right ear, crosses = left ear. Inter-individual standard deviations for the thresholds, varied between 5.3 and 11.2 dB in the control group, and between 5.8 and 13.8 dB in the NAC group