Table 4

Predictors of positive immune response (seroconversion)*
P-value OR 95% CI
Age (years) <0.001 0.96 0.94-0.98
Sex (male/female) 0.984 0.99 0.57-1.73
Diagnosis (RA/SpA) 0.361 0.77 0.43-1.36
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

Open Data