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Fig. 3 | BMC Infectious Diseases

Fig. 3

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

Fig. 3

True and estimated VE’s when only biases B1 and B2 are present. We set the risk ratio P(NFARI if healthy)/P(NFARI if frail) =0.75 and let the risk ratio R2 = P(FARI if healthy)/P(FARI if frail) vary between 0.5 to 1.0. The probabilities of vaccination are 0.4 and 0.8 for healthy and frail persons, respectively

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BMC Infectious Diseases

ISSN: 1471-2334

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