Frequent daytime naps predict vocabulary growth in early childhood.

J Child Psychol Psychiatry · 2016 · PMC5017299 · PMID 27322102

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highly significantno p-value reported

As expected, age was a highly significant predictor of expressive and receptive vocabulary scores (see Table 2 ).

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approached significanceno p-value reported

The effect of sleep efficiency and the number of naps approached significance: children who had more naps during the day and had better sleep efficiency tended to have enhanced predicted growth.

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