Figure. Unadjusted pooled survival curves among the vaccinated study population. Outcomes include influenza-like illness (A); hospitalization for influenza/pneumonia (B); and death (C). In matched years, vaccination is expected to be effective in preventing influenza-related outcomes; in mismatched years, the expected effect is minimal.
McGrath LJ, Kshirsagar AV, Cole SR, Wang L, Weber DJ, Stürmer T, Brookhart MA. Influenza Vaccine Effectiveness in Patients on HemodialysisAn Analysis of a Natural Experiment. Arch Intern Med. 2012;172(7):548-554. doi:10.1001/archinternmed.2011.2238
Author Affiliations: Department of Epidemiology, Gillings School of Global Public Health (Ms McGrath and Drs Cole, Weber, Stürmer, and Brookhart), Divisions of Nephrology and Hypertension (Dr Kshirsagar) and Infectious Diseases (Dr Weber), Department of Medicine, and The Cecil G. Sheps Center for Health Services Research (Dr Wang), University of North Carolina, Chapel Hill.