Table 3.
Percentages of articles with significant effects in analyses of disorder groups relative to controls and percentages of significant effects that occurred in the same direction. One additional article not included in this table (due to measurement differences in quantifying Wave V) presented significantly lower amplitude in the V-Va complex in children with language-based learning problems relative to controls32. Note that one article by Purdy and colleagues33 included in the LD group Wave V row in this table had participants with both LD and suspected auditory processing disorder. This article found no significant amplitude effect and was the only one with significantly earlier latency for the disorder group relative to controls.
| Disorder | Wave | Amplitude | Latency | ||||
|---|---|---|---|---|---|---|---|
| No. of articles (no. of analyses) | Percent analyses with sig. effect | Percent with smaller amplitude in disorder group | No. of articles (no. of analyses) | Percent analy-ses with sig. effect | Percent with later latency in disorder group | ||
| LD | I | 1(2) | 0% | NA | 1(2) | 50.0% | 100%* |
| DLD | I | 1(1) | 100%* | 100%* | 3(4) | 25.0% | 100%* |
| LD | III | 1(2) | 0% | NA | 2(3) | 33.3% | 100%* |
| DLD | III | 0 | NA | NA | 4(5) | 60% | 100% |
| LD | V | 4(7) | 0% | NA | 6(9) | 55.56% | 60% |
| DLD | V | 5(6) | 33.3% | 100% | 11(21) | 57.1% | 100% |
| LD | A/Vn | 3(5) | 0% | NA | 5(7) | 71.4% | 100% |
| DLD | A/Vn | 2(2) | 50% | 100%* | 7(14) | 57.1% | 100% |
Results Significance and Consistency.
*Indicates only one analysis included in percentage calculation.