Zinc lozenges may shorten the duration of colds: a systematic review.

Open Respir Med J · 2011 · PMC3136969 · PMID 21769305

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highly significantno p-value reported

There is a highly significant heterogeneity between the 13 trials on the basis of both the χ 2 and I 2 -tests, with χ 2 (12 df) = 109 and I 2 = 89%.

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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.