Results of voice analyses in HD and HC subjects.

*p<0.05; **p<0.01; ***p<0.001. MPT = maximum phonation time, MPTVB = maximum phonation time until first break, NVB = number of voice breaks, DUV = degree of voicelessness, F0 SD = variability of fundamental frequency, RPDE = recurrence period density entropy, PPE = pitch period entropy, HNR = harmonics-to-noise ratio, DFA = detrended fluctuation analysis, MFCC = mel-frequency cepstral coefficient.