and our data were weighted to 2010 Census estimates of the U.S. adult population, which has different demographic characteristics than the 2000 Census (e.g., a higher proportion of Hispanics). These demographic changes in the U.S. population could account for some of the difference. The National Stressful Events Survey used a self-administered, highly structured survey approach. Fewer people were skipped out of the PTSD-symptom module in the National Stressful Events Survey than in the NCS-R because we included people who reported exposure to other stressful events as well as Criterion A events. Another unique feature of the National Stressful Events Survey was the approach to assessment of PTSD in reference to any reported Criterion A event types as opposed to a select subset of events. This approach entailed asking about symptoms without a priori determining selected events. As described, those reporting symptoms then were asked to identify all types of events related to specific symptoms. Finally, a recent study by Wolford and colleagues (2008) found similar response rates and criterion validity for assessment of PTSD based on in-person interviews or assessments conducted by computer. In any case, the prevalence estimates based on DSM-IV criteria from the National Stressful Events Survey and
