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. Author manuscript; available in PMC: 2012 Jul 1.
Published in final edited form as: Arch Neurol. 2011 Mar 14;68(7):870–878. doi: 10.1001/archneurol.2011.34

Figure 1. Ascertainment of PLEX cohort and sample size for each analysis.

Figure 1

Exclusions included: receiving fewer than two exchanges (n=2), receiving PLEX for an attack related to a co-existing condition and not due to a CNS-IDD attack (diabetic neuropathy, n=1; polycythemia vera, n=1). PLEX=plasma exchange; CNS-IDD=central nervous system inflammatory demyelinating disease. NMOSD=NMO spectrum disorder (ie. NMO, LETM, recurrent optic neuritis).