Figure 1.

Kaplan-Meier survival analysis showed a significantly reduced survival in those with seizures compared to those without ((a), log rank test, *p < 0.01). In (b) seizure onset was quantified for each seizure case as a proportion of when seizures started from disease onset/total disease length (disease onset to death). This demonstrates that the majority of cases occurred in the latter half of their disease. In (c) seizure onset has been quantified from the time from wheelchair use to seizure onset/time from wheelchair use to death. Thus a negative × axis score indicates seizures occurred before wheelchair use started. This illustrates that the majority of seizures occurred after wheelchair use.