Longitudinal stability in reading comprehension is largely heritable from grades 1 to 6.

PLoS One · 2015 · PMC4300224 · PMID 25602760

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may not be significantno p-value reported

Finally, shared environment influences may also be important to stability in early reading, even though they may not be significant in later reading.

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Quoted from the open-access full text in Europe PMC under the licence the publisher applied. The sentence is reproduced exactly as published; the emphasis is ours.