Comparative efficacy of interventions to promote hand hygiene in hospital: systematic review and network meta-analysis.

BMJ · 2015 · PMC4517539 · PMID 26220070

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showed a trendno p-value reported

Of 22 pairwise comparisons from interrupted time series, 18 showed stepwise increases in compliance with hand hygiene, and all but four showed a trend for increasing compliance after the intervention.

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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.