Prospective hospital-based case-control study to assess the effectiveness of pandemic influenza A(H1N1)pdm09 vaccination and risk factors for hospitalization in 2009-2010 using matched hospital and test-negative controls.

BMC Infect Dis · 2012 · PMC3464893 · PMID 22650369

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did not reach statistical significanceno p-value reported

The OR for additional variables added to the model did not reach statistical significance and had minimal further influence on the effect of these covariates.

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