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Box-plot representation of baseline serum MMP-9 measurements in patients with quiescent CD who subsequently flared during follow-up period of 24 months versus those who did not. Baseline serum MMP-9 levels in relapsers differed significantly from nonrelapsers (p < 0.001). The limits of the box represent the first and third quartiles; the black crossbar line represents the median.
CD, Crohn’s disease; MMP-9, matrix metalloproteinase-9.
