Two meta-analyses reported the prevalence of PTSD.

• One found a prevalence of diagnosed PTSD after floods of 16% (95% CI 0.11–0.21)
• The other reported a prevalence of PTSD in children and adolescents after earthquakes and floods of 20.8% between 0 and 6 months after the event, 14.6% at 6–12 months, and 16.3% at 12–18 months.