Behavioural Neurology / 2020 / Article / Tab 2 / Research Article
Changes in the Rhythm of Speech Difference between People with Nondegenerative Mild Cognitive Impairment and with Preclinical Dementia Table 2 Comparison of the voice parameters used between older people with nondegenerative MCI and those expected to develop AD. Mann-Whitney
test of independent samples and means of the two groups.
Parameters nodMCI mean (SD) preAD mean (SD) Mann-Whitney Duration parameters Duration (reading time) 47.48 (22.20) 61.74 (20.95) 243 (-2.791) Phonation time (sec) 32.35 (10.39) 39.44 (8.75) 213 (-3.153) Speech rate 3.35 (0.80) 3.07 (0.92) 583 (1.308) Pauses number 25.79 (16.34) 34.23 (14.64) 283 (-2.310) Speech fluency and rhythm parameters Normalized_PVI 54.27 (5.42) 59.97 (5.76) 215 (-3.128) Syll_Interv_DAverage 0.19 (0.03) 0.20 (0.02) 416 (-0.705) Syll_Interv_Δ Standar 0.10 (0.02) 0.11 (0.02) 246 (-2.755) VARCO of syllabic interval duration 0.51 (0.07) 0.55 (0.09) 349 (-1.513) Syllabus interval number 154.01 (51.88) 178.08 (33.94) 223 (-3.033) Articulation rate 4.63 (0.59) 4.54 (0.60) 519 (0.537) Fundamental frequency and spectral analysis F0 mean (Hz) 168.61 (28.90) 164.82 (20.21) 514 (0.476) F0 mean (Hz_men) 138.86 (25.17) 138.84 (16.31) 41 (0.077) F0 mean (Hz_women) 172.12 (16.34) 170.09 (13.73) 250 (0.230) Asymmetry (skewness, Hz) 11.33 (4.14) 8.62 (4.38) 645 (2.056) Center of gravity (CoG_Hz) 446 (98) 568 (227) 321 (-1.851) Center of gravity SD (CoG_sd) 547 (191) 753 (318) 276 (-2.393) LTAS mean (dB) 32.46 (2.31) 30.20 (2.00) 763 (3.478) LTAS mean (dB_men) 32.41 (2.64) 30.47 (2.33) 30 (-0.878) LTAS mean (dB_women) 32.48 (2.20) 30.07 (1.97) 401 (3.247) LTAS SD (dB) 40.32 (2.10) 38.16 (2.82) 738 (3,177) LTAS SD (dB_men) 40.21 (2.31) 38.46 (3.08) 57 (1.317) LTAS SD (dB_women) 40.37 (2.03) 38.03 (2.88) 388 (2.987) LTAS range 50-1000 Hz 44.87 (2.03) 43.26 (2.37) 694 (2.646) LTAS range 50-1000 Hz_men 46.24 (2.12) 44.76 (3.27) 51 (0.852) LTAS range 50-1000 Hz_women 46.40 (2.06) 43.98 (4.12) 369 (2.608) LTAS 1 kHz-2 kHz 27.13 (3.29) 26.21 (4.98) 513 (0.464) LTAS 2 kHz-4 kHz 17.87 (4.59) 17.94 (2.98) 480 (0.066) Intensity parameters Intensity mean (dB) 75.36 (1.77) 73.63 (2.00) 735 (3.141) Intensity mean (dB_men) 74.94 (0.41) 73.94 (0.91) 55 (1.162) Intensity mean (dB_women) 75.98 (0.41) 73.51 (0.60) 390 (3.027) Intensity mean_SD (dB) 17.28 (10.54) 14.77 (2.94) 551 (0.922) Intensity SD (dB_men) 19.24 (14.31) 12.76 (4.26) 51 (0.852) Intensity SD (dB_women) 16.55 (8.78) 15.66 (1.79) 198 (-0.809) Amplitude minimum -9.08 (13.53) 25.01 (12.44) 551 (0.922) Intensity Minim (dB_men) -23.19 (129.34) 27.59 (14.61) 46 (0.465) Intensity Minim (dB_women) -3.76 (107.83) 23.85 (12.14) 285 (0.929) Intens Diferenc Max-Min Mean (dB) 95.55 (13.40) 61.76 (12.26) 377 (-1.175) Intens Dif Max-Min (dB_men) 109.22 (129.34) 58.79 (14.07) 34 (-0.465) Intens Dif Max-Min (dB_women) 90.37 (107.68) 63.07 (12.03) 181 (-1.149) Acoustic Voice Quality parameters Jitter (local) 2.42 (1.07) 2.35 (0.66) 427 (-0.567) Shimmer Loc (dB) 1.12 (0.27) 1.19 (0.22) 394 (-0.965) Voice breaks (%) 38.93 (11.01) 43.93 (13.24) 333 (-1.706) Acoustic Voice Quality Index (AVQI) 6.00 (1.18) 6.17 (0.95) 425 (-0.597) HNR (dB) 12.96 (3.50) 11.91 (3.18) 570 (1.151)
