Bar graphs of absolute latency were plotted comparing male with female rats for 8, 16, and 32 kHz at the ages tested for waves I through V. Statistics comparing male with female rats at each age were conducted using two-way ANOVA using Sidak’s multiple comparison test where *P<0.05. The level of significance was P<0.05, where *P<0.05, **P<0.01, ***P<0.001, ****P<0.0001.