By applying the formula given above to all of the halved p -values of the regressions shown and then comparing the test statistic to a chi-squared distribution with 12 degrees of freedom (−2 Σ k i = 1 ln(p i ) = 20.994), the resulting pooled p -value is 0.050458, which is close to significance.
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Effects of Lifelong Musicianship on White Matter Integrity and Cognitive Brain Reserve.
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