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Table 3 Three scenarios for vaccination probabilities

From: A comparison of the test-negative and the traditional case-control study designs for estimation of influenza vaccine effectiveness under nonrandom vaccination

Vaccination scenario Definition
1 Random vaccination, \(\alpha _{0}^{\ \mathrm {a}} = \alpha _{1}^{\ \mathrm {b}} = 0.6\)
2 Healthy individuals are more likely to be vaccinated than frail individuals: α 0=0.4, α 1=0.8.
3 Healthy individuals are less likely to be vaccinated than frail individuals: α 0=0.8, α 1=0.4.
  1. a α 0 is the probability of vaccination for frail persons
  2. b α 1 is the probability of vaccination for health persons