# Prosody-Based Measures for Automatic Severity Assessment of Dysarthrie Speech
## 4 Materials
### Data Analysis
#### 4.3.3 Rhythm  
In general, English speakers with dysarthria have higher values than healthy speakers for most cases except %V and Varco-V as shown in Table 4. With the exception of %V in mild speakers, all Korean speakers with dysarthria have higher values for both vowel and consonant measures. Furthermore, the differences between healthy and dysarthric speech are larger in Korean speakers than English speakers. For example, the standard deviation of vowel intervals (Delta-V) is 60.70 and 66.23 in healthy English and mild dysarthric speakers, respectively, while the same measure is 65.69 and 98.75 for Korean healthy and mild dysarthric speakers, respectively.  
Rhythm metrics are the only group of prosody-based measures to have a significant two-way interaction for both English, where F (4.77, 17.49) = 8.21, \(p<0.0001\), and Korean datasets, where F (4.13, 45.43) = 8.05, \(p<0.0001\). With the English TORGO dataset, a simple main effect of the severity group is significant for CrPVI, Delta-C, Delta-V, and Varco-C (\(p<0.05\)). The mean rhythm score is significantly different in healthy vs. severe and mild vs. severe pairs for CnPVI, CrPVI, Delta-C, and Varco-C (\(p<0.05\)). There is also a significant difference in Delta-V between healthy and severe utterances (\(p<0.05\)). Lastly, there is a significant difference in Varco-C between moderate and severe utterances (\(p<0.05\)). For the Korean QoL dataset, simple main effects are significant for VrPVI, CrPVI, Delta-C, Delta-V, %V and Varco-C. Pairwise comparisons tests reveal significant differences between healthy and severe utterances for CrPVI, Delta-C, Delta-V, and %V (\(p<0.05\)), and between healthy and moderate utterances for CrPVI and Delta-C (\(p<0.05\)). Significant differences are also present between mild and severe utterances for all measures, except CnPVI and Varco-V (\(p<0.05\)), and between moderate and severe utterances for Delta-C, Delta-V, and %V (\(p<0.05\)).  
\begin{table}
\begin{tabular}{c c c c c c c c c c} \hline \hline
**Speaker** & **\%V** & **Delta-V** & **Delta-C** & **Varco-V** & **Varco-C** & **VrPVI** & **CrPVI** & **VnPVI** & **CnPVI** \\ \hline TORGO-healthy & 41.72 & 60.70 & 73.28 & 53.18 & 50.89 & 66.20 & 81.85 & 55.85 & 56.89 \\ TORGO-mild & 42.50 & 66.23 & 72.56 & 54.18 & 50.00 & 71.14 & 75.01 & 57.67 & 52.89 \\ TORGO-mod & 41.78 & 94.23 & 104.32 & 47.03 & 50.92 & 105.87 & 113.87 & 50.48 & 55.48 \\ TORGO-severe & 46.23 & 121.06 & 147.46 & 50.24 & 64.21 & 133.62 & 162.25 & 53.40 & 67.41 \\ QoL-healthy & 54.37 & 65.69 & 51.79 & 57.59 & 55.23 & 67.52 & 65.78 & 61.51 & 70.36 \\ QoL-mild & 54.06 & 98.74 & 77.74 & 59.94 & 57.26 & 101.99 & 93.62 & 61.89 & 69.06 \\ QoL-mod & 56.31 & 120.13 & 93.47 & 56.58 & 59.62 & 126.75 & 105.42 & 59.95 & 67.26 \\ QoL-severe & 64.71 & 217.85 & 125.35 & 58.88 & 64.22 & 237.38 & 139.24 & 60.90 & 71.84 \\ \hline \hline \end{tabular}
\end{table}
Table 4: Mean values for all rhythm metrics from TORGO and QoL datasets.  
\begin{table}
\begin{tabular}{c c c c c c c c} \hline \hline
**Corpus** & **Speaker Group** & **\# of Syllables** & **\# of Pauses** & **Speaking Rate** & **Artic. Rate** & **Speaking Duration** & **Total Duration** \\  & Healthy & 9.12 & 0.17 & 2.00 & 4.14 & 2.22 & 4.50 \\ TORGO & Mild & 10.67 & 1.40 & 1.75 & 3.53 & 3.10 & 6.22 \\  & Moderate & 10.78 & 2.09 & 1.78 & 3.33 & 3.38 & 6.60 \\  & Severe & 12.21 & 1.82 & 1.69 & 3.17 & 3.77 & 7.13 \\  & Healthy & 11.75 & 0.09 & 3.00 & 4.58 & 2.52 & 3.83 \\ QoLT & Mild & 13.14 & 1.45 & 2.29 & 3.82 & 3.58 & 6.00 \\  & Moderate & 13.91 & 3.29 & 1.69 & 3.42 & 4.19 & 8.96 \\  & Severe & 17.53 & 4.74 & 1.64 & 3.47 & 5.29 & 11.49 \\ \hline \hline \end{tabular}
\end{table}
Table 3: Mean values for all speech rate measures from the QoL and TORGO datasets.