Effect of numbering of return envelopes on participation, explicit refusals, and bias: experiment and meta-analysis.

BMC Med Res Methodol · 2014 · PMC3898011 · PMID 24428941

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nominally significantno p-value reported

Among the 1000 random permutations of group assignment (i.e., under the null hypothesis), the number of nominally significant tests varied between 0 and 25 out of 105.

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