Table I. Participant characteristics.
| Characteristic | Probands
|
Sibling pairs
|
Disability pairs
|
|||||
|---|---|---|---|---|---|---|---|---|
| Males with DMD (n=50) | One-sample t statistic | Males with DMD (n=24) | Control siblings (n=24) | Paired t statistic | Males with DMD (n=23) | Males with CP (n=23) | Paired t statistic | |
| Age range; mean (SD), y:m | 6–14 | – | 6–12 | 6–15 | 1.37 | 6–9 | 6–8 | 7.09a |
| 9:4 (2:1) | 9:1 (1:8) | 9:11 (2:4) | 7:8 (1:2) | 6:8 (0:8) | ||||
| PPVT SS range; mean (SD) | 67–137 | 1.65 | 70–137 | 76–145 | 1.99 | 66–124 | 68–120 | 3.24a |
| 103.8 (16.1) | 105.1 (16.1) | 110.1 (17.2) | 99.5 (14.3) | 98.0 (14.8) | ||||
a
Significant finding (p<0.05) on between-group paired t-tests. DMD, Duchenne muscular dystrophy; PPVT SS, Peabody Picture Vocabulary Test Standard Score. For probands, no significant difference was found between scores on PPVT SS and expected value of 100.