Annals of Epidemiology
Volume 19, Issue 6 , Pages 432-436, June 2009

Pooling of Confounders Did Not Induce Residual Confounding in Influenza Vaccination Studies

  • Rolf H.H. Groenwold, MD

      Affiliations

    • Julius Center for Health Sciences and Primary Care, University Medical Center Utrecht, the Netherlands
    • Corresponding Author InformationAddress correspondence to: R.H.H. Groenwold, MD, University Medical Center Utrecht, Julius Center for Health Sciences and Primary Care, PO BOX 85500, 3508 GA, Utrecht, the Netherlands. Tel.: 31-88-756-8874; fax: 31-88-756-8099.
    • ,
  • Eelko Hak, MSC, PhD

      Affiliations

    • Julius Center for Health Sciences and Primary Care, University Medical Center Utrecht, the Netherlands
    • Department of Epidemiology, University Medical Center Groningen, the Netherlands
    • ,
  • Arno W. Hoes, MD, PhD

      Affiliations

    • Julius Center for Health Sciences and Primary Care, University Medical Center Utrecht, the Netherlands

Received 3 October 2008; accepted 5 February 2009.

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 This study is part of a personal grant of Dr. E. Hak to study confounding in observational intervention studies by the Netherlands Scientific Organization (VENI no. 916.56.109). There are no conflicts of interest.

PII: S1047-2797(09)00059-3

doi:10.1016/j.annepidem.2009.02.001

Annals of Epidemiology
Volume 19, Issue 6 , Pages 432-436, June 2009

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