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Comparison of the infliximab trough levels between patients with/without antibody to infliximab. In the ATI-negative and -positive groups, the median infliximab trough levels (IFX-TLs) were 1.415 μg/mL (IQR 0.570-2.495) and 0.141 μg/mL (IQR 0.002-0.869), respectively (P < 0.001). ATI: Antibodies to infliximab.
