Ref (type)	Population	Outcome, Interventions	Results and statistical analysis	Effect size	Favours
Proportion of people with PTSD
RCT 3-armed trial	48 people admitted to a surgical trauma centre with severe injuries	Proportion of people diagnosed with PTSD (assessed using various scales) 4 months 2/10 (20%) with gabapentin (initially 300 mg three times daily increasing to 400 mg three times daily over 2 days) 4/16 (25%) with placebo	Significance not assessed People with and without risk factors for PTSD after injury were enrolled in the RCT The RCT may have been underpowered to detect clinically meaningful differences between groups