Item	Derivation
A weather disaster (e.g., flood, bushfire, storm, cyclone) damage or destroy your home.	Adapted from ‘trauma exposure’ items in McDermott et al. [19,77]: ‘experienced damage to [your] home, including broken windows, damage to part or all of [your] roof or other home damage’. Exposure to the traumatic event (i.e., witnessing actual flames) and proxy measures of exposure such as home damage, are significant predictors of adverse emotional outcomes in all published predictive models.
Did any of the following happen as a result of this weather-related disaster?(a) You thought you might die	Adapted from O’Donnell [76], item #6 from the final ten-item measure, p.929, ‘During the event, I thought I was about to die’; and adapted from McDermott et al. [19,77]. In the latter research, of all measured variables, threat perception had the strongest relationship with post-disaster post-traumatic stress disorder.
(b) You personally knew people who were killed or badly injured.	Adapted from O’Donnell [76], item #6 from the original list of peri-trauma items, p.926, ‘I witnessed other people being killed or injured’; and adapted from McDermott et al. [19,77], perceived threat of death to self and perceived threat of death to parents (for children and adolescents).
(c) You felt terrified, helpless or hopeless.	Consistent with diagnostic criteria (A2) for PTSD (DSMIV) and ICD entry criteria. Adapted from O’Donnell [76], item #5 from the final ten-item measure, p.929, ‘At the time of the event, I felt terrified, helpless or hopeless’.
(d) You are still currently distressed about it.	Allows calculation of point prevalence of post-disaster distress and differentiation from other possible causes of anxiety; can be validated against related constructs measured in the same survey. This item provides insight into whether ongoing stress and anxiety are directly related to the traumatic event (in addition to any relationships we may find with other measures of health and wellbeing).