Table 1.
Participant characteristics
| 50 boys w/MD | 20 boys w/MD | 20 siblings | Paired-t (1, 19) | p-value | |
|---|---|---|---|---|---|
| Age in years | |||||
| Range | 4–12 | 4–12 | 4–12 | 0.34 | Ns |
| Mean, SD | 8.92, 2.33 | 8.84, 2.51 | 8.32, 2.12 | ||
| PPVT-III SS | |||||
| Range | 67–159 | 67–159 | 82–160 | 2.81 | 0.01 |
| Mean, SD | 101.96, 18.94 | 104.91, 21.34 | 112.91, 17.59 | ||
| Ravens CPM | |||||
| Range | 78–130 | 78–127 | 90–135 | 1.16 | Ns |
| Mean, SD | 100.86, 12.65 | 100.56, 13.87 | 109.10, 12.68 | ||
The 20 boys with MD were also included in the group of 50 boys with MD. Matched comparisons were done on the 20 proband-sibling pairs. MD = Duchenne or Becker muscular dystrophy. Ns = non-significant. SD = standard deviation. PPVT-III = Peabody Picture Vocabulary Test-III. SS = standard score. Ravens CPM = Ravens Colored Progressive Matrices