Shared environmental influences on mathematics, word decoding, and reading comprehension are nearly identical across the three domains¶
Claim · All claims
Evidence · 1 study · associationalr3·q3
Currency · newest study 2012 · 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? Shared environmental correlations among the three latent factors were uniformly high and not significantly different from unity, despite small shared environmental variance components. → Harlaar 2012
Evidence¶
Harlaar 2012¶
Harlaar, N., Kovas, Y., Dale, P. S., Petrill, S. A., & Plomin, R. (2012). Mathematics is differentially related to reading comprehension and word decoding: Evidence from a genetically-sensitive design. Journal of Educational Psychology, 104(3). https://doi.org/10.1037/a0027646
q3 · i? · associational · r3
Genetic model-fitting in the age-12 twin cohort. Although shared environmental influences accounted for only small proportions of variance (c2 = .02–.18 at measure level), the shared environmental correlations were "uniformly high and not significantly different from unity".
"The shared environmental correlations, in contrast, were uniformly high and not significantly different from unity."
Discussion¶
Related Claims¶
- At age 12, mathematics is more strongly correlated with reading comprehension than with word decoding at the phenotypic latent-factor level — related
- Etiological links between reading skills and mathematics did not differ across the specific mathematics tests used — related
- A common genetic factor influences mathematics, word decoding, and reading comprehension, with substantial genetic overlap across all three domains — related
- Reading comprehension retains genetic and nonshared environmental influences independent of both mathematics and word decoding — related
- Word decoding is significantly more heritable (.84) than mathematics (.60) and reading comprehension (.64) at age 12 — related
Page metadata
| Field | Value |
|---|---|
type |
claim |
id |
shared-environmental-correlations-unity-math-reading |
title |
Shared environmental influences on mathematics, word decoding, and reading comprehension are nearly identical across the three domains |
description |
Shared environmental influences on mathematics, word decoding, and reading comprehension are nearly identical across the three domains |
status |
review |
evidence_strength |
moderate |
newest_evidence |
2012 |
generated |
by process:wiki-ingest on 2026-10-25 |
trust |
unverified — no one has confirmed this page's content |
sources |
1 — harlaar-2012 |
Frontmatter is the page's machine-readable record — see the Schema & Guide.