The effect of giving influenza vaccination to general practitioners: a controlled trial [NCT00221676].

BMC Med · 2006 · PMC1538610 · PMID 16831228

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an increasing trendno p-value reported

The efficacy (= 100(1 – RR)) of vaccination in preventing positive nose and throat swabs showed an increasing trend from 22% in 2002 to 49% in 2003, but this trend was not statistically significant, even when both years (41%) were combined.

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