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. 2016 May 12;6(5):e011291. doi: 10.1136/bmjopen-2016-011291

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Flow chart of the study phase and the procedure used to select participants for the study. The survey in 2011 (phase 1) was conducted 6 months after the disaster (from September to December 2011). The original cohort consisted of 10 196 participants in phase 1. The next survey (phase 2) was carried out 18 months after the disaster (from September to December 2012). The average period between phase 1 and phase 2 was 11 months. We excluded a total of 2689 persons who did not participate in the phase 2 survey and 979 persons who lacked at least one variable used for analysis. We finally used data from 6528 participants for analysis.