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Abbreviations: ARR = adjusted relative risk, CI = confidence interval, CTBIE = Comprehensive TBI Screening and Evaluation, ICD-9-CM = International Classification of DiseasesNinth Revision-Clinical Modification, mTBI = mild traumatic brain injury, NPCD = National Patient Care Database, NSI = Neurobehavioral Symptoms Inventory, OEF = Operation Enduring Freedom, OIF = Operation Iraqi Freedom, OND = Operation New Dawn, PTSD = posttraumatic stress disorder, RR = relative risk, SSN = Social Security number, TBI = traumatic brain injury, VA = Department of Veterans Affairs.
The sintering experiments of additive-free D-D type nPCD compacts from OLCs were carried out in a CS-1B type hexahedron anvils press.
The ICD-9-CM codes contributing to the ACCs were combined from both the VA and Medicare sources: the VA NPCD and Fee basis files as well as Medicare claims files.
Patient race was obtained from the SHEP (i.e., survey self-report) and supplemented with administrative data from the NPCD when missing.
While it is most likely that the diagnosis of TBI is appropriately entered into the NPCD system for those individuals with persistent symptoms who are referred and/or seen by the specialty programs for care, it is unclear whether those individuals who have sustained a TBI but have had complete resolution of symptoms are consistently recorded for this exposure in the system.
Using the NPCD outpatient and inpatient files, we first identified patients with SCI using the ICD-9-CM diagnosis codes (3440x, 3441, 806x, 9072, 952x).
The outpatient encounter data from the NPCD was used for sample selection as well as to search for a second PTSD diagnosis code within 4 months of the first.
ARC 23,916 SCD Registry 30,655 NPCD Flag 15,096 SCD Registry & ARC 16,897 SCD Registry & NPCD Flag 12,784 NPCD Flag & ARC 14,575 Overlap All Sources 12,306 Note: Table made from pie chart
The data sources for this study were the fiscal year (FY) 2005 VHA National Patient Care Database (NPCD) Event and Bed Section files, which contain records of every healthcare encounter for more than 5 million veterans who annually receive care from VHA, and VistAWeb, which is an intranet Web application of VistA .
The databases we used to identify the population of women veterans were the VHA National Enrollment Database (NED) and National Patient Care Database (NPCD), the VBA Compensation and Pension Mini File (CP) and Veterans Service Network (VETSNET), and the DOD Defense Enrollment Eligibility Reporting System (DEERS).
Veterans' racial/ethnic affiliation in VA data is entered into the local healthcare facility electronic medical record known as the Computerized Patient Record System by healthcare facility personnel and then transmitted with patient healthcare encounter data to the VA's centralized data repository at the Austin Information Technology Center, where it is stored in the National Patient Care Database (NPCD).
For services prior to FY1997 (i.e., before October 1, 1996), the inpatient Patient Treatment File (PTF) and outpatient care (OPC) SAS files can be used to verify self-reported use of VHA inpatient and outpatient services, respectively; Medical SAS datasets generated from the PTF and National Patient Care Database (NPCD) can be used to verify post-FY1997 inpatient and outpatient utilization, respectively (Table 2) .
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