Figure 1.

Flow-chart of participants in the study. A postal questionnaire was sent to all Norwegians aged 18 or above who were repatriated to Norway after the tsunami (n = 2468) at two time points; 6 months postdisaster (T1) and two years postdisaster (T2). Response rate at T1 was 36% (n = 899) and 48% (n = 1180) at T2, whereas 674 individuals responded at both times and constituted the study population (27% of the total population). 225 persons were lost to follow up resulting in 75% response rate at T2 according to T1-population, whereas 506 persons responded at T2 only.