Children with comorbid RDMD are significantly more impaired than children with isolated RD or MD in math, reading, and executive function outcomes¶
Claim · All claims
Evidence · 1 study · quant-synthesisr2·q3
Currency · newest study 2023 · not yet checked against its sources · not reviewed by a person
Subclaims¶
Reading the evidence codes
q is the design tier, i the impact, n the sample, and the kind with its r
the rigour judged within that kind: what each code means.
This claim: no standardized effect is recorded in observations/ for it yet, so no benchmark reading is possible.
q3 i? In EF outcomes, the comorbid group was significantly more impaired than both isolated groups (both p < 0.01), while MD and RD did not differ from each other (p = 0.66). → Nurit Viesel-Nordmeyer 2023
Evidence¶
Nurit Viesel-Nordmeyer 2023¶
Nurit Viesel-Nordmeyer, Julia Reuber, Jörg-Tobias Kuhn, Kristina Moll, Heinz Holling, Christian Dobel. (2023). Cognitive Profiles of Children with Isolated and Comorbid Learning Difficulties in Reading and Math: a Meta-analysis. Educational Psychology Review. https://doi.org/10.1007/s10648-023-09735-3
q3 · i? · quant-synthesis · r2
Meta-analytic comparison of pooled EF effect sizes for C-RD (0.35), C-MD (0.40), and C-RDMD (0.71). The comorbid group was "significantly more impaired than both the MD and RD group (both p < 0.01)"; no pairwise effect size is printed.
"Two of these three effects differed significantly from each other: the comorbid group was sig-nificantly more impaired than both the MD and RD group (both p < 0.01)."
Discussion¶
Related Claims¶
- Executive function deficits in comorbid RDMD show some evidence of under-additivity, especially in inhibition, shifting, and updating — related
- The math deficit profile of children with comorbid RDMD is additive: it equals the sum of the deficits of isolated RD and MD groups — related
- The reading deficit profile of children with comorbid RDMD is additive relative to isolated RD and MD — related
- The comorbid RD+MD group is more impaired than groups with RD only or MD only on seven of ten neuropsychological composites — related
- In reading-related outcomes, group differences involving RD or RDMD are largest for reading tasks and phonological processing and smallest for RAN — related
- Group differences in math skills between LD and comorbid groups are more pronounced in symbolic than non-symbolic math tasks — related
- Children with MD only receive extra math assistance far less often than children with comorbid RD+MD — related
Page metadata
| Field | Value |
|---|---|
type |
claim |
id |
rdmd-more-impaired-than-isolated-groups |
title |
Children with comorbid RDMD are significantly more impaired than children with isolated RD or MD in math, reading, and executive function outcomes |
description |
Children with comorbid RDMD are significantly more impaired than children with isolated RD or MD in math, reading, and executive function outcomes |
status |
review |
evidence_strength |
moderate |
newest_evidence |
2023 |
generated |
by process:wiki-ingest on 2026-10-19 |
trust |
unverified — no one has confirmed this page's content |
sources |
1 — nurit-viesel-nordmeyer-2023 |
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