Impacts of active school design on school-time sedentary behavior and physical activity: A pilot natural experiment.

PLoS One · 2017 · PMC5720751 · PMID 29216300

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highly significantno p-value reported

Although sample sizes were small, they did provide adequate statistical power to detect highly significant within-subject changes and between-group differences.

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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.