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Dyslexia and developmental language disorder: Comorbid disorders with distinct effects on reading comprehension
Snowling, Margaret J. Hayiou-Thomas, Marianna E. Nash, Hannah M. Hulme, Charles
Snowling, Margaret J.
Hayiou-Thomas, Marianna E.
Nash, Hannah M.
Hulme, Charles
Abstract
Background: Reading comprehension draws on both decoding and linguistic comprehension, and poor reading comprehension can be the consequence of a deficit in either of these skills. Methods: Using outcome data from the longitudinal Wellcome Language and Reading Project, we identified three groups of children at age 8 years: children with dyslexia (N = 21) who had deficits in decoding but not oral language, children with Developmental Language Disorder (DLD; N = 38) whose decoding skills were in the normal range, and children who met criteria for both dyslexia and DLD (N = 29). Results: All three groups had reading comprehension difficulties at the ages of 8 and 9 years relative to TD controls though those of the children with dyslexia were mild (relative to TD controls, d = 0.51 at age 8, d = 0.60 at age 8); while the most severe problems were found in the comorbid dyslexia + DLD group (d = 1.79 at age 8, d = 2.06 at age 9) those with DLD also had significant difficulties (d = 1.56 at age 8, d = 1.56 at age 9). Conclusions: These findings confirm that children with dyslexia or DLD are at‐risk for reading comprehension difficulties but for different reasons, because of weak decoding in the case of dyslexia or weak oral language skills in the case of DLD. Different forms of intervention are required for these groups of children, targeted to their particular area(s) of weakness.
Keywords
Date
2019
Type
Journal article
Journal
Journal of Child Psychology and Psychiatry
Book
Volume
Issue
Page Range
1-9
Article Number
ACU Department
Institute for Learning Sciences and Teacher Education (ILSTE)
Faculty of Education and Arts
Faculty of Education and Arts
Relation URI
Source URL
Event URL
Open Access Status
Open access
License
CC BY 4.0
File Access
Open