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Background We used data from the National Health Insurance Research Database (NHIRD) of Taiwan to determine whether patients who develop posttraumatic parkinsonism (PTP) after traumatic brain injury (TBI) have an increased mortality risk. Methods We analyzed data from the NHIRD of patients aged ≥20 years who had received a diagnosis of and admitted for head injury with TBI (ICD-9-CM 850-854, 959.01) from 2000 to 2012. The TBI cohort was further divided into PTP and posttraumatic non-parkinsonism (PTN) cohorts and compared against a sex-, age-, comorbidity-,