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Figure 3: Mean DPOAE (2F1–F2) amplitudes (DP) and noise levels (NL) of those in final sample and those who presented an audiometric notch (AN) by frequency for (a) left and (b) right ears. Significant differences in means from unpaired t tests are given by * for P < 0.05 and ** for P < 0.01

Figure 3: Mean DPOAE (2<i>F</i><sub>1</sub>–<i>F</i><sub>2</sub>) amplitudes (DP) and noise levels (NL) of those in final sample and those who presented an audiometric notch (AN) by frequency for (a) left and (b) right ears. Significant differences in means from unpaired <i>t</i> tests are given by <sup>*</sup> for <i>P</i> < 0.05 and <sup>**</sup> for <i>P</i> < 0.01