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Math Learning Disability and Math LD Subtypes

Evidence from Studies of Turner Syndrome, Fragile X Syndrome, and Neurofibromatosis Type 1

Human Growth and Development Program in the Department of Population and Family Health Sciences at the Johns Hopkins School of Public Health, mazzocco{at}kennedykrieger.org, Johns Hopkins School of Medicine

The present study examined whether indicators of math learning disability are observed m 5- and 6-year-olds with neurofibromatosis type 1 (NF1) and in 5- to 6-year-old girls with Turner syndrome or fragile X syndrome. Data from 14 girls with Turner syndrome, 9 girls with fragile X syndrome, and 11 children with NF1 were compared to data from control participants matched on age, sex, IQ score, and grade level. The results indicate that girls with fragile X syndrome or Turner syndrome are significantly more likely to have specific math difficulties relative to their control group, with a larger effect size demonstrated by the group with Turner syndrome. Young children with NF1 had a heterogeneous profile not suggestive of specific math disability. The results are discussed in terms of their implications for understanding math disability subtypes and the identification of math difficulty in the early school years.

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