Understanding comorbidity of learning disorders: task-dependent estimates of prevalence

Journal of Child Psychology and Psychiatry, and Allied Disciplines
Kristina MollGerd Schulte-Körne

Abstract

Reading disorder (RD) and mathematics disorder (MD) frequently co-occur. However, the exact comorbidity rates differ largely between studies. Given that MD is characterised by high heterogeneity on the symptom level, differences in comorbidity rates may result from different mathematical subskills used to define MD. Comorbidity rates with RD are likely to be higher when MD is measured by mathematical subskills that do not only build on number processing, but also require language (i.e. arithmetic fluency), than when measured by magnitude processing skills. The association between literacy, arithmetic fluency and magnitude processing as well as the overlap between deficits in these domains were assessed in a representative sample of 1,454 third Graders. Associations were significantly higher between literacy and arithmetic, than between literacy and magnitude processing. This was also reflected in comorbidity rates: comorbidity rates between literacy and arithmetic deficits were four times higher than expected by chance, whereas comorbidity rates between literacy and magnitude processing deficits did not exceed chance rate. Deficits in the two mathematical subskills showed some overlap, but also revealed dissociations, corrobora...Continue Reading

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Citations

Sep 18, 2020·Oxford Review of Education·Margaret J SnowlingKate Nation
Sep 22, 2020·Journal of Child Psychology and Psychiatry, and Allied Disciplines·Margaret J Snowling, Charles Hulme
Oct 10, 2020·Research in Developmental Disabilities·Ann Dowker
Mar 25, 2019·Deutsches Ärzteblatt International·Stefan Haberstroh, Gerd Schulte-Körne
Mar 16, 2021·Frontiers in Psychology·Marije D E HuijsmansEvelyn H Kroesbergen
Jun 3, 2021·Brain Sciences·Pierluigi ZoccolottiDaniele Luigi Romano
Sep 30, 2021·Dyslexia : the Journal of the British Dyslexia Association·Turid HellandWenche A Helland

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