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. Author manuscript; available in PMC: 2010 Jul 1.
Published in final edited form as: Arch Neurol. 2009 Jul;66(7):858–864. doi: 10.1001/archneurol.2009.122

Figure 1. Kaplan-Meier curve for time until conversion from relapsing-remitting to secondary progressive MS.

Figure 1

Legend: Smoking status was defined at study entry. Current smokers progressed significantly faster than the never smokers (p=0.0016). Red=current smokers, green=ex-smokers, black=never smokers.