Barely Significant
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Differences in sleep spindles and polysomnography in humans: a meta-analysis on the influence of age, sex, and cognitive ability.

Front Sleep · 2026 · PMC13120934 · PMID 42058455

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0.0200
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highly significantp = 0.02actually significant
The combined correlation effect of EEG spindle power with cognitive ability for all ages was also highly significant and positive [k = 6, n = 88, r = 0.49 (0.06, 0.76), p r = 0.004, I 2 = 63.42%, Egger's regression's p = 0.02, Figure 10 and Supplementary Table 33 ].

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