Kaplan-Meier table analysis of patients with corticobasal degeneration after onset of symptoms; the y axis refers to proportion of patients who are alive (surviving) at a given time point. Kaplan-Meier table analysis of patients with corticobasal degeneration after onset of symptoms; the y axis refers to proportion of patients who are alive (surviving) at a given time point. The x axis is survival in years. G K Wenning et al. J Neurol Neurosurg Psychiatry 1998;64:184-189 ©1998 by BMJ Publishing Group Ltd