Influenza vaccine effectiveness in preventing hospitalizations and deaths in persons 65 years or older in Minnesota, New York, and Oregon: data from 3 health plans Journal Article uri icon
  • This study developed methods and determined the impact of influenza vaccination on elderly persons in 3 large health plans: Kaiser Permanente Northwest, HealthPartners, and Oxford Health Plans. Data for the 1996-1997 and 1997-1998 seasons were extracted from administrative databases. Subjects were health plan members > or = 65 years old. Comorbid conditions collected from the preceding year were used for risk adjustment with logistic regression. The virus-vaccine match was excellent for year 1 and fair for year 2. Both years, during peak and total periods, vaccination reduced all causes of death and hospitalization for pneumonia and influenza: hospitalizations were reduced by 19%-20% and 18%-24% for years 1 and 2, respectively, and deaths were reduced by 60%-61% and 35%-39% for the same periods. These results show that all elderly persons should be immunized annually for influenza. The methods used in this study are an efficient cost-effective way to study vaccine impact and similar questions.

  • Link to Article
    publication date
  • 2001
  • published in
  • *Influenza Vaccines
  • Age Factors
  • Aged
  • Health Maintenance Organizations/*statistics & numerical data
  • Hospitalization/*statistics & numerical data
  • Influenza, Human/*epidemiology/mortality/*prevention & control
  • Inpatients/statistics & numerical data
  • Minnesota
  • New York
  • Oregon
  • Outpatients/statistics & numerical data
  • Regression Analysis
  • Risk Assessment
  • Risk Factors
  • Seasons
  • Additional Document Info
  • 184
  • issue
  • 6