Table 2. . Researchers characteristics.

Investigator institutional affiliation
Academic only	2
VA only	6
Dual academic and VA affiliation	8
Engagement model (some investigators used multiple models)
Center-based VEG	6
Ad hoc or informal engagement:  • Input on project development  • Participation in study implementation  • Instrument design  • Results dissemination	7
Project-specific veteran engagement board	3
Miscellaneous engagement	2
Research topics for which veterans were engaged
Chronic disease	1
Opioid use	1
Post-traumatic stress disorder	4
Suicide prevention	1
Traumatic brain injury	1
Multiple research topics	8

VA: Veterans Health Administration; VEG: Veteran engagement group.