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. 2018 May 15;90(20):e1771–e1779. doi: 10.1212/WNL.0000000000005522

Figure 1. Data sources and sampling.

Figure 1

All patients with TBI and a 2% random sample of all patients who met the specified inclusion criteria were identified from the nationwide VHA NPCD and the CTBIE database. A 1:1 age matching of patients with and without TBI was then performed for a final study cohort of 325,870 patients. CTBIE = Comprehensive Traumatic Brain Injury Evaluation; NPCD = National Patient Care Database; PD = Parkinson disease; TBI = traumatic brain injury; VHA = Veterans Health Administration.