Fig. 2From: The 23-valent pneumococcal polysaccharide vaccine in patients with rheumatoid arthritis: a double-blinded, randomized, placebo-controlled trialPneumonia-free survival curves of RA patients receiving PPSV23 and placebo. Statistically significant difference was not observed between patients receiving PPSV23 and placebo (P = 0.084, log-rank test)Back to article page