Table 3.
Descriptive statistics comparing the four clusters (i.e., typically developing [TD], borderline [B], Dysarthria 1 [DYS1], and Dysarthria 2 [DYS2]) on each speech measure and overall intelligibility.
| Speech measure | TD cluster (n = 17) |
B cluster (n = 6) |
DYS1 cluster (n = 6) |
DYS2 cluster (n = 9) |
|---|---|---|---|---|
| Mdn | Mdn | Mdn | Mdn | |
| Proportion of bursts produced | 0.94 | 0.72 | 0.86 | 0.83 |
| F2 range of diphthongs (Hz) | 1465 | 1521 | 1256 | 2.23 |
| Nasality rating | 1.60 | 1.90 | 3.40 | 4.8 |
| Proportion of deviant voice quality | 0.06 | 0.13 | 0.04 | 0.11 |
| Proportion of closure interval with voicing | 0.41 | 0.33 | 0.49 | 0.29 |
| Articulation rate (syll/s) | 3.24 | 3.01 | 2.92 | 2.29 |
| Overall intelligibility (%) | 91.59 | 86.92 | 58.22 | 38.62 |