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Cumulative incidence rates of complications including (A) 90-day pneumonia and (B) 30-day readmission in COPD patients and non-COPD patients after receiving total knee replacement. The log-rank test demonstrated significant differences in complication risks between the two groups. The cumulative incidence curves show that patients with COPD had a higher incidence rate than those without COPD. COPD = chronic obstructive pulmonary disease.
