AQP4 and optic neuritis: To investigate if antibody diagnosis was a significant factor associated with fatigue in patients without optic neuritis alone phenotypes (optic neuritis alone phenotype being more common in MOG‐Ab disease, that is, 36.4% vs. 13.3% in AQP4‐Ab disease, and may be less likely to cause fatigue), we restricted this analysis to those who ever had TM.