Reading disability with motor problems may be an inherited subtype.

There is evidence from a number of studies that various forms of reading disability are inherited. The familial patterns of one specific type of reading disability that occurs together with impaired coordination and balance were evaluated. Ten reading-disabled children with these motor problems, ten children with only reading problems, and ten control children without reading disabilities were examined along with their siblings and parents. The control children were matched to the reading-disabled children for age, sex, and family socioeconomic status. A high prevalence of reading and motor problems was found in the relatives of the children with reading disability and motor problems, whereas a high prevalence of only reading problems was found in the relatives of the children with only reading disability. There were no differences among the three groups of children or their siblings on number of pregnancy and birth complications or prevalence of attention deficit disorder. It was concluded that reading disability with motor problems may be an inherited type of reading disability, distinct from reading disability without motor problems, which is also inherited.