Findings on multiple episodes, number and duration of ENL episodes.

†Only cases with multiple episodes of ENL reported, this accounted for 28.4% of MB cases. This study is excluded from the calculations.‡49 (45%)single, 27 (25%) two, 13 (12%) three, 6 (5%)four, 2 (2%) five, 5 (5%) >five episodes.§45(49%) single, 28 (30%)two, 14 (11%) three, 5 (5%) four or more episodes.**Of the original cohort of 116 patients, 28 were excluded because they had too short follow-up and could not be categorized.††37.5% having acute multiple ENL (i.e. more than one episode lasting less than six months, steady decrease in steroid tapering) and 62.5% chronic ENL (i.e. episode lasting for more than six months).‡‡13 (25%)single, 12 (24%)two, 14 (27%)three, 11(22%)four, 1(2%)five episodes.§§Vaccine versus control group; 3 vs 3 single, 4 vs 4 two, 3 vs 2 three, 0 vs 3 more than three episodes.***An episode of ENL was taken as a separate event if more than 3 months had elapsed since the last episode.