| Study | Participants | VRET environment | VRET equipment | Comparison | Total N | Experiment/ control (N/N) | VRET sessions | Drop (E/C) |
| Difede et al. (2007) | Firefighters, non-rescue disaster workers, and civilians | A computer simulation of 911attacks | Head mounted display | Waitlist control | 21 | 13/8 | 6-13 (M = 7.5) | 1/0 |
| Ready et al. (2010) | U.S. Vietnam veterans | Virtual Vietnam environment | Head mounted display | Present-centered therapy | 11 | 6/5 | 10 | 1/1 |
| Mclay et al. (2011) | Active duty soldiers | Computer-simulated version | Head mounted display and joystick controller | Treatment as usual (M = 8.8) | 20 | 10/10 | 4-20 | No |
| Sarah et al. (2012) | Returning warfighters | 3D computer-generated combat environment | A high resolution stereoscopic helmet with a head tracker | Minimal attention | 22 | 10/12 | 10 | 1/1 |
| Reger et al. (2016) | Active duty soldiers | VR Iraq/Afghanistan software | Head mounted display | Prolonged exposure | 108 | 54/54 | 10 | 24/22 |
| Reger et al. (2016) | Active duty soldiers | VR Iraq/Afghanistan software | Head mounted display | Waitlist control | 108 | 54/54 | 10 | 24/7 |
| Mclay et al. (2017) | Active duty soldiers | Computer-simulated version of combat | Head mounted display and joystick controller | Control exposure therapy | 85 | 42/43 | 8 | No |