Fig. 3From: The 23-valent pneumococcal polysaccharide vaccine in patients with rheumatoid arthritis: a double-blinded, randomized, placebo-controlled trialPneumonia-free survival curves of RA patients with or without interstitial lung disease (ILD). Curves are stratified by the presence or absence of ILD. Statistically significant differences were observed between patients with or without ILD (P < 0.0001, log-rank test)Back to article page