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Medians and interquartile ranges of the change in AC and BC ABR threshold with age in BALB/c mice. The threshold changes are relative to the median threshold in the 37-day-old group. Each curve represents a different stimulus frequency. Thresholds that were limited by the stimulus ceiling were coded as 5 dB above the ceiling as described in the caption to Figure 6. The dotted lines without symbols display exponential increases in threshold sensitivity of 0.1 and 0.2 dB/day.
