Table 3 Performances of the children test set "CH1" (with breakup for different pitch groups based on original average pitch values) with and without pitch-normalization. The quantity in bracket shows the number of utterances in that group. The 95% confidence interval for the performance is 0.39 (for the 250 Hz, 250–300 Hz, and 300 Hz pitch groups the confidence interval turns out to be 0.39, 0.79, and 3.37, resp.).