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Pure-tone audiograms. Mean pure-tone hearing thresholds in dB HL at frequencies 250–8000 Hz (=0.250–8 kHz). The solid line indicates the mean thresholds for all subjects (n = 75), while the dashed lines indicate the LD and HD subgroups (n = 32 and 43, respectively). Error bars indicate the standard error at each frequency. MANOVA shows no significant differences in hearing thresholds between the groups.
