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ABR wave 1 amplitudes for 5, 10, 34 week old mice (mean ± SD) show that suprathreshold amplitudes at (A) 8kHz and (B) 16kHz do not show a difference in threshold values, but at (C) 32kHz, there is a significant difference decrease in suprathreshold values for old mice (34 weeks) in comparison to 5 week old mice.
