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Figure 2: Mean DPOAE (2F_{1}–F_{2}) amplitudes (DP) and noise levels (NL) at each frequency between [<80 dB(A)] and [(a and b) 80–85 dB(A), (c and d) >85 to <90 dB(A), and (e and f) ≥90 dB(A)] for left and right ears. Significant differences in means from unpaired t test are given by ^{*} for P < 0.05 and ^{**} for P < 0.01 
