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. Author manuscript; available in PMC: 2009 Sep 1.
Published in final edited form as: Hear Res. 2008 May 23;243(1-2):57–68. doi: 10.1016/j.heares.2008.05.006

Figure 4.

Figure 4

Mean optimal f2/f1 ratio (ordinate) vs. primary-tone level (abscissa). A) The f2/f1 ratios which elicited the most robust DPOAEs for each ear were averaged to determine the mean optimal f2/f1. B) Right vs. left ear. DPOAEs were averaged only in subjects in which both ears were tested and the mean optimal f2/f1 was that which elicited the most robust mean DPOAE (n = 10 ears). C) Male vs. female. DPOAEs were averaged across both ears in males and females and the f2/f1 which elicited the most robust mean DPOAE was considered optimal.