Language and learning disorders of older boys with Duchenne muscular dystrophy.

The IQs of 25 males with Duchenne muscular dystrophy were determined and the results were pooled with those for 76 others reported in the literature to examine the relationship between IQ and age. Verbal IQ was significantly lower than Performance IQ among the younger boys, but not the older. The distribution of Verbal IQ of the older boys was bimodal, suggesting that a verbal deficit persists in some cases. Detailed examination of the cognitive and reading skills of 15 older patients revealed a similar pattern of deficient phonological processing and reading skills in about half of this group.