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BACKGROUND • Flare is one of the most commonly used outcome variables in SLE clinical trials. 1,2 • The SELENA flare index (SFI) has functioned well in clinical and clinical trial settings, 3 but has the limitation that it classifies only severe versus combined mild/moderate flares. • Since mild flares are often clinically insignificant, and it is useful to distinguish flares by organ system, a revision of the SELENA flare index 4 was carried out to define severe, moderate and mild flaresdoi:10.1136/annrheumdis-2013-eular.1420 fatcat:ajhweajjevbmhpg2ildo4pkpva