Frequency and impact of confounding by indication and healthy vaccinee bias in observational studies assessing influenza vaccine effectiveness: a systematic review.

PubWeight™: 0.80‹?›

🔗 View Article (PMC 4609091)

Published in BMC Infect Dis on October 17, 2015

Authors

Cornelius Remschmidt1, Ole Wichmann2, Thomas Harder3

Author Affiliations

1: Immunization Unit, Robert Koch Institute, Seestrasse 10, 13353, Berlin, Germany. remschmidtc@rki.de.
2: Immunization Unit, Robert Koch Institute, Seestrasse 10, 13353, Berlin, Germany. wichmanno@rki.de.
3: Immunization Unit, Robert Koch Institute, Seestrasse 10, 13353, Berlin, Germany. hardert@rki.de.

Articles cited by this

Preferred reporting items for systematic reviews and meta-analyses: the PRISMA statement. Ann Intern Med (2009) 35.37

Mortality benefits of influenza vaccination in elderly people: an ongoing controversy. Lancet Infect Dis (2007) 5.91

Vaccines for preventing influenza in the elderly. Cochrane Database Syst Rev (2010) 4.49

Evidence of bias in estimates of influenza vaccine effectiveness in seniors. Int J Epidemiol (2005) 4.04

Influenza vaccination and risk of community-acquired pneumonia in immunocompetent elderly people: a population-based, nested case-control study. Lancet (2008) 3.23

Functional status is a confounder of the association of influenza vaccine and risk of all cause mortality in seniors. Int J Epidemiol (2005) 2.92

The test-negative design for estimating influenza vaccine effectiveness. Vaccine (2013) 2.67

Observer bias in randomised clinical trials with binary outcomes: systematic review of trials with both blinded and non-blinded outcome assessors. BMJ (2012) 2.11

Effects of annual influenza vaccination on mortality and hospitalization in elderly patients with ischemic heart disease: a nationwide population-based study. Prev Med (2012) 2.04

Burden of influenza-like illness and effectiveness of influenza vaccination among working adults aged 50-64 years. Clin Infect Dis (2009) 1.97

Estimating influenza vaccine effectiveness in community-dwelling elderly patients using the instrumental variable analysis method. Arch Intern Med (2012) 1.86

Maternal influenza immunization and reduced likelihood of prematurity and small for gestational age births: a retrospective cohort study. PLoS Med (2011) 1.82

A cohort study of the effectiveness of influenza vaccine in older people, performed using the United Kingdom general practice research database. J Infect Dis (2004) 1.77

Impact of maternal influenza vaccination during pregnancy on the incidence of acute respiratory illness visits among infants. Arch Pediatr Adolesc Med (2006) 1.75

New strategies are needed to improve the accuracy of influenza vaccine effectiveness estimates among seniors. J Clin Epidemiol (2009) 1.72

Influenza vaccine effectiveness in patients on hemodialysis: an analysis of a natural experiment. Arch Intern Med (2012) 1.64

Mortality of dialysis patients according to influenza and pneumococcal vaccination status. Am J Kidney Dis (2012) 1.61

Confounding by indication in non-experimental evaluation of vaccine effectiveness: the example of prevention of influenza complications. J Epidemiol Community Health (2002) 1.61

Influenza vaccination and mortality: prospective cohort study of the elderly in a large geographical area. Eur Respir J (2007) 1.54

Influenza vaccine effectiveness in preventing hospitalization for pneumonia in the elderly. Am J Epidemiol (1992) 1.47

Influenza vaccination and mortality benefits: new insights, new opportunities. Vaccine (2009) 1.24

Influenza vaccine effectiveness in preventing hospitalization among the elderly during influenza type A and type B seasons. Int J Epidemiol (1995) 1.09

Influenza vaccination is not associated with a reduction in the risk of recurrent coronary events. Am J Epidemiol (2002) 1.06

Challenges in evaluating influenza vaccine effectiveness and the mortality benefits controversy. Vaccine (2009) 1.04

Observer bias in randomized clinical trials with time-to-event outcomes: systematic review of trials with both blinded and non-blinded outcome assessors. Int J Epidemiol (2014) 0.97

After adjusting for bias in meta-analysis seasonal influenza vaccine remains effective in community-dwelling elderly. J Clin Epidemiol (2014) 0.94

Influenza vaccination among college and university students: impact on influenzalike illness, health care use, and impaired school performance. Arch Pediatr Adolesc Med (2008) 0.93

Further evidence for bias in observational studies of influenza vaccine effectiveness: the 2009 influenza A(H1N1) pandemic. Am J Epidemiol (2013) 0.93

Influenza vaccination reduces hospitalization for acute coronary syndrome in elderly patients with chronic obstructive pulmonary disease: a population-based cohort study. Vaccine (2014) 0.92

Influenza vaccination and all-cause mortality in community-dwelling elderly in Ontario, Canada, a cohort study. Vaccine (2010) 0.91

Impact of influenza vaccination on mortality risk among the elderly. Eur Respir J (2009) 0.90

Influenza but not pneumococcal vaccination protects against all-cause mortality in patients with COPD. Thorax (2009) 0.90

Influenza vaccination is associated with reduced severity of community-acquired pneumonia. Eur Respir J (2010) 0.89

Influenza vaccine effectiveness in the elderly based on administrative databases: change in immunization habit as a marker for bias. PLoS One (2011) 0.88

Influenza vaccination and major adverse vascular events in high-risk patients. Circulation (2012) 0.86

Why do covariates defined by International Classification of Diseases codes fail to remove confounding in pharmacoepidemiologic studies among seniors? Pharmacoepidemiol Drug Saf (2011) 0.84

Effect of influenza vaccine status on winter mortality in Spanish community-dwelling elderly people during 2002-2005 influenza periods. Vaccine (2007) 0.81

Benefits of influenza vaccine in US elderly--appreciating issues of confounding bias and precision. Int J Epidemiol (2006) 0.81

To rule out confounding, observational studies of influenza vaccine need to include analyses during the "preinfluenza period". Arch Intern Med (2007) 0.79