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Figure 3: Average DP-grams for 65 dB SPL primary tone showing distortion product otoacoustic emission (DPOAE) levels as a function of geometric-mean frequencies from 6 to 32 kHz. (a) Postnoise DPOAE levels decreased significantly at 6, 7, and 10 kHz compared with prenoise baseline levels. *P = 0.000 versus postnoise day 0. (b) On postnoise day 8, experimental groups show lower DPOAE levels than the control group at 6 and 7 kHz. **P = 0.014/0.048 for 6/7 kHz. A noise floor averaged for all groups is indicated at the bottom of each plot

Figure 3: Average DP-grams for 65 dB SPL primary tone showing distortion product otoacoustic emission (DPOAE) levels as a function of geometric-mean frequencies from 6 to 32 kHz. (a) Postnoise DPOAE levels decreased significantly at 6, 7, and 10 kHz compared with prenoise baseline levels. *<i>P</i> = 0.000 versus postnoise day 0. (b) On postnoise day 8, experimental groups show lower DPOAE levels than the control group at 6 and 7 kHz. **<i>P</i> = 0.014/0.048 for 6/7 kHz. A noise floor averaged for all groups is indicated at the bottom of each plot