Disaster exposure was the randomly selected TE for 661 respondents across the 18 surveys (Table 2). In 10 surveys, none of the respondents met DSM-IV/CIDI criteria for PTSD, while in the remaining eight surveys mean weighted PTSD prevalence was 2.5% (18 observed PTSD cases across surveys). Six of the latter eight surveys (accounting for 86.3% of respondents across all eight) were done in high-income countries and the other two in low-/middle-income countries. PTSD prevalence estimates were, on average, higher in the surveys in high- than low-/middle-income countries (2.8% v. 0.4%; t = 1.9, p = 0.051).
