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DP-grams are plotted by age, noise exposure, and tinnitus group. Mean data is shown with a thick line. Thin lines indicate data for individual ears. Note that the same ears are plotted in each subplot, but grouped differently. If the measured DPOAE level was less than −20 dB SPL or the signal-to-noise ratio was less than 6 dB, the DPOAE level was set at −20 dB SPL. NVF = Non-Veteran Firearms, NVC = Non-Veteran Controls, V = Veterans
