Kaplan-Meier survival plot for primary endpoint of arthritis development. Kaplan-Meier survival plot for primary endpoint of arthritis development. Arthritis-free survival (%) depicted over time in months. At the 25th percentile, a difference of 12 months between the group receiving placebo (blue) versus rituximab (red) was observed (black horizontal line). The number of individuals at risk in each group at every follow-up time point is shown below the graph, follow-up was discontinued after development of arthritis. Danielle M Gerlag et al. Ann Rheum Dis 2019;78:179-185 ©2019 by BMJ Publishing Group Ltd and European League Against Rheumatism