Acoustic characteristics of the statements and questions and their final syllables.

Mean F0 (in st) is the average fundamental frequency of the sentence (or the final syllable); duration (in s) is the length of the sentence (or the final syllable); mean intensity (in dB) is the mean-energy intensity of the sentence (or the final syllable); pitch range (in st) is defined as the difference in fundamental frequency between maximum and minimum F0 of the sentence; glide size (in st) is the pitch excursion size of the final syllable ( = maximum F0−minimum F0); glide time (in s) is the duration between maximum and minimum F0 of the final syllable; glide rate (in st/s) = glide size/glide time; μ = mean; σ = standard deviation; t is the statistic of the paired t-test (two-tailed, df = 19).