The number of respondents with disaster-related PTSD in the two low-/middle-income countries was too small (n = 2 of n = 60 respondents) to estimate logistic regression equations separately. We consequently excluded low-/middle-income countries from further analysis. Median (interquartile range) number of years between the index disaster and the WMH interview in the remaining 6 surveys was 14 (3–35) years.
