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Correlation between TEOAE amplitude and age. The TEOAE amplitude in quiet of both ears decreased with age, and showed a significant correlation (**, P<0.01). A, B: The TEOAE amplitude in quiet at the left ear. All age groups showed a deteriorating trend according to the histogram. C, D: The TEOAE amplitude in quiet at the right ear. All age groups showed a deteriorating trend according to the histogram (*, P<0.05; **, P<0.01).
