TABLE 2.
Mean values of, and correlations between, QPA and semantic measures for fluent and non-fluent groups
|
Fluent (n = 8) |
Non-fluent (n = 8) |
Correlations |
||||
|---|---|---|---|---|---|---|
| Mean (SD) | Mean (SD) | t-test p-value1 | with %CIUs2 | with TTR2 | with H:L2 | |
| Severity rating | 3.06 (1.08) | 2.75 (1.04) | 0.565 | ** 0.899 | * 0.632 | 0.316 |
| Discourse Productivity Measures (QPA) | ||||||
| Total Narrative Words | 1250.5 (793.2) | 610.9 (442.9) | * 0.036 | * 0.442 | 0.040 | −0.391 |
| % Narrative Words | 0.65 (0.13) | 0.62 (0.15) | 0.326 | ** 0.919 | * 0.556 | 0.386 |
| Speech Rate (wpm) | 93.80 (43.82) | 37.59 (25.63) | ** 0.005 | 0.318 | −0.101 | −0.296 |
| Sentence Productivity Measures (QPA) | ||||||
| % Words in Sentences | 0.80 (0.12) | 0.47 (0.34) | * 0.015 | 0.353 | −0.260 | * −0.458 |
| Median Utterance Length (MLU) | 5.75 (1.04) | 3.75 (2.66) | * 0.039 | * 0.551 | −0.006 | −0.364 |
| Sentence Elaboration Index | 2.14 (0.64) | 1.70 (1.06) | 0.171 | ** 0.739 | 0.423 | −0.013 |
| Embedding Index | 0.14 (0.07) | 0.08 (0.08) | * 0.048 | 0.286 | 0.103 | 0.140 |
| Grammatical Accuracy Measures (QPA) | ||||||
| % Sentences Well-Formed | 0.74 (0.13) | 0.81 (0.10) | 0.134 | 0.239 | * 0.529 | 0.245 |
| Auxiliary Score | 1.15 (0.19) | 0.71 (0.54) | * 0.029 | * 0.509 | −0.027 | −0.042 |
| Verb Inflection | 0.94 (0.07) | 0.70 (0.35) | * 0.047 | 0.423 | −0.003 | −0.197 |
| Determiner Index | 0.92 (0.04) | 0.62 (0.32) | * 0.017 | * 0.454 | −0.266 | * −0.446 |
| Lexical Distribution Measures (QPA) | ||||||
| % Function Words | 0.57 (0.05) | 0.47 (0.09) | ** 0.009 | −0.153 | * −0.538 | * −0.532 |
| % Pronouns/ Nouns + Pronouns | 0.45 (0.15) | 0.25 (0.22) | * 0.025 | −0.337 | ** −0.811 | * −0.508 |
| % Verbs/ Nouns + Verbs | 0.50 (0.12) | 0.27 (0.21) | * 0.012 | −0.125 | ** −0.778 | * −0.437 |
| Semantic Measures | ||||||
| % CIUs | 0.530 (0.15) | 0.500 (0.21) | 0.377 | 1.000 | ** 0.646 | 0.351 |
| TTR | 0.464 (0.12) | 0.583 (0.13) | * 0.039 | |||
| TTR (without A3) | 0.464 (0.12) | 0.555 (0.11) | 0.075 | 1.000 | ** 0.575 | |
| H:L Verb Ratio | 0.658 (0.37) | 1.144 (0.49) | * 0.028 | 1.000 | ||
1
One-tailed unpaired t-tests (* p<.05; ** p<.01); severity is two-tailed.
2
Criterion value for directional significance is r>.57 (** p<.01) or r<.43 (* p<.05).
Note: In Gordon (2006) the values for determiner index and % closed class words were inadvertently exchanged. The correct values are shown here.