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Cumulative incidence rates of serious infections to week 144. CZP, certolizumab pegol; PBO, placebo; PY, patient‐years; Q2W, every 2 weeks; TEAE, treatment‐emergent adverse event. aPatients on CZP 200 mg Q2W received a loading dose of CZP 400 mg at weeks 0, 2 and 4. Error bars correspond to 95% confidence intervals.
