|Predictors of positive immune response (seroconversion)*|
|Time between vaccination and retrieving of blood samples (months)||0.334||0.97||0.91-1.03|
|Current smoking (yes/no)||0.025||0.47||0.24-0.91|
|Pre-vaccination antibody titers||0.001||0.97||0.94-0.99|
Analysis was performed using a multivariate logistic regression model. CI, confidence interval; HI, hemagglutination inhibition; OR, odds ratio.
* Seroconversion is defined as prevaccination titres <10 and postvaccination HI ≥40 or a ≥4-fold increase in HI titers.
Kapetanovic et al.
Kapetanovic et al. Arthritis Research & Therapy 2014 16:R2 doi:10.1186/ar4427