Table 3.
Group mean (standard deviation) for vowel duration (ms; collapsed across vowels), average vowel spacing (mels), and vowel dispersion (mels; collapsed across vowels) for younger controls (YCON), older controls (OCON), the apraxia of speech (AOS) group, and the aphasia without AOS (APH) group.
| Measure | Group | Time point (%) | Condition |
Difference | |
|---|---|---|---|---|---|
| Silence | Noise | ||||
| Duration | YCON (n = 11) | 135 (25) | 156 (29) | −21 | |
| OCON (n = 12) | 136 (17) | 157 (23) | −21 | ||
| AOS (n = 6) | 171 (26) | 194 (36) | −23 | ||
| APH (n = 4) | 120 (23) | 143 (24) | −23 | ||
| AVS | YCON (n = 11) | 20 | 321 (32) | 292 (40) | 29 |
| 50 | 373 (31) | 334 (44) | 39 | ||
| 80 | 373 (43) | 327 (49) | 46 | ||
| OCON (n = 12) | 20 | 348 (39) | 337 (33) | 11 | |
| 50 | 388 (46) | 376 (35) | 12 | ||
| 80 | 356 (44) | 341 (35) | 14 | ||
| AOS (n = 6) | 20 | 343 (84) | 306 (74) | 37 | |
| 50 | 373 (75) | 332 (68) | 41 | ||
| 80 | 341 (67) | 306 (64) | 35 | ||
| APH (n = 4) | 20 | 364 (83) | 341 (83) | 23 | |
| 50 | 401 (100) | 379 (88) | 22 | ||
| 80 | 364 (104) | 342 (107) | 22 | ||
| Dispersion | YCON (n = 11) | 20 | 35 (9) | 36 (8) | −1 |
| 50 | 41 (11) | 40 (9) | 1 | ||
| 80 | 39 (12) | 41 (11) | −2 | ||
| OCON (n = 12) | 20 | 36 (8) | 35 (7) | −1 | |
| 50 | 39 (10) | 37 (10) | −2 | ||
| 80 | 41 (10) | 40 (10) | −1 | ||
| AOS (n = 6) | 20 | 45 (5) | 42 (3) | 3 | |
| 50 | 51 (10) | 43 (5) | 8 | ||
| 80 | 51 (8) | 43 (7) | 8 | ||
| APH (n = 4) | 20 | 43 (12) | 37 (9) | 6 | |
| 50 | 45 (14) | 32 (7) | 13 | ||
| 80 | 45 (16) | 33 (10) | 12 | ||