Figure 1

Figure 1

The figure shows the distribution of time taken to progress from DSS 3 to DSS 6 (A), 8 (B) and 10 (C) in SPMS patients compared with that for the time taken from the onset of MS to DSS 10 in PP and RP patients. DSS, disability status score; PP, primary progressive; RP, relapsing-progressive; SP, secondary progressive; SPMS, secondary progressive multiple sclerosis. Reproduced with permission from Kremenchutzky M, et al. Brain 1999;122:1941-50.