Considerations for Use of Propensity Score Matching in Specific Patient Populations

To the Editor Zarinsefat and colleagues¹ evaluated the long-term outcomes following kidney and liver transplants in recipients with HIV using a retrospective cohort study. Patients who are HIV-positive tend to have other comorbidities, including concomitant infections or AIDS-related conditions. These inadvertently affect whether the patient is considered for a transplant. Thus, to control for confounding, the authors used propensity score matching and concluded that kidney and liver transplants in HIV-positive patients had comparable long-term outcomes with those in matched HIV-negative patients.