Attack severity and recovery.

*While 349 in the overall cohort had a second event during follow-up, of those in the CHAMPIONS and ONTT cohorts (total n = 152, 104 (68%) of whom had a second attack), second attack severity was not calculable for ONTT patients and was calculable for 28 (61%) of CHAMPIONS patients who had a second attack. Second attack recovery was calculable for 34 CHAMPIONS patients and no ONTT patient; ** could not be characterized for 2 second events among non-ONTT/non-CHAMPIONS cohorts; *** could not be characterized for 16 first attacks overall or for 11 second events among non-ONTT/non-CHAMPIONS cohorts.