What do systematic reviews say?

Any early psychological intervention vs inactive control (usual care care, attention control, waitlist)

It is very uncertain whether any early psychological intervention changes PTSD diagnosis: 7–12 months compared with waiting list/usual care (very low certainty).

• Multiple session early psychological interventions for the prevention of post‐traumatic stress disorder 2019 · Cochrane Headline outcomes only
  RR 0.94 [0.2, 4.49]
  1 study · 132 participants
  Very low