Table 4.
Summary of significant variables per each group contrast based on Fisher’s LSD post-hoc test results. The column “mean difference” shows the actual magnitudes of the effects. The sign of the effect reflects the mean value of the second group in each pair subtracted from the mean value of the first group in the pair.
| Group comparisons | Statistically Significant Variables | Direction of the effect | Mean Difference | Std. Error | p-value |
|---|---|---|---|---|---|
| NSMI vs. TD | None | ||||
| SMI vs. TD | Vowel Space | SMI < TD | −372739 | 83749 | <0.0001 |
| Vowel Duration | SMI > TD | 67.5 | 30.6 | 0.0337 | |
| F2 Slope “Pipe” | SMI < TD | −2.7 | 0.9 | 0.0043 | |
| F2 Slope “Whip” | SMI < TD | −4.1 | 1.1 | 0.0007 | |
| Word intelligibility | SMI < TD | −37.87 | 6.20 | < 0.0001 | |
| SMI vs. NSMI | Vowel Space | SMI < NSMI | 296313 | 105382 | 0.0078 |
| Vowel Duration | SMI > NSMI | −76.887 | 37.259 | 0.0459 | |
| F2 Slope “Pipe” | SMI < NSMI | 2.1 | 1.1 | 0.048 | |
| F2 Slope “Whip” | SMI < NSMI | 5.9 | 1.4 | 0.0001 | |
| F2 Slope “Toys” | SMI < NSMI | 4.6 | 1.5 | 0.0042 | |
| Word intelligibility | SMI < NSMI | 36.15 | 7.47 | <0.0001 |