Reading comprehension retains genetic and nonshared environmental influences independent of both mathematics and word decoding¶
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? 33% of genetic variance and 38% of nonshared environmental variance in reading comprehension were independent of mathematics and word decoding. → 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
Cholesky decomposition in the age-12 twin sample. A third genetic factor accounted for "33% of the genetic variance in reading comprehension" independent of mathematics and word decoding; a parallel nonshared environmental factor accounted for 38% (.06/.16) of nonshared environmental variance.
"Finally, 33% of the genetic variance in reading comprehension reflected genetic influences independent of mathematics and word decoding (represented by A3)."
Discussion¶
Related Claims¶
- A common genetic factor influences mathematics, word decoding, and reading comprehension, with substantial genetic overlap across all three domains — related
- Etiological links between reading skills and mathematics did not differ across the specific mathematics tests used — related
- The genetic correlation between mathematics and reading comprehension (.76) is significantly higher than between mathematics and word decoding (.50) — related
- Reading comprehension variance is fully shared with listening comprehension and word reading — related
- Word decoding is significantly more heritable (.84) than mathematics (.60) and reading comprehension (.64) at age 12 — related
- Genetic influences drive the phenotypic correlations between cognitive skills and reading components — related
- Shared environmental influences on mathematics, word decoding, and reading comprehension are nearly identical across the three domains — related
Page metadata
| Field | Value |
|---|---|
type |
claim |
id |
reading-comprehension-genetic-influences-independent-of-decoding-and-math |
title |
Reading comprehension retains genetic and nonshared environmental influences independent of both mathematics and word decoding |
description |
Reading comprehension retains genetic and nonshared environmental influences independent of both mathematics and word decoding |
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 |
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