The RISK Project began data collection in November of 2003. Two waves of data collection occurred prior to the hurricane. Data collection also occurred one and four years after Katrina. Researchers at the risk project have been investigating how research design- including the availability of data before the hurricane, as well as the longitudinal nature of the data- may elucidate the complex relationships between trauma exposure and psychological distress.
Lowe, S. R., Green, G. & Rhodes, J. E. (2012). What can multi-wave studies teach us about disaster research?: An analysis of low-income Hurricane Katrina survivors. Journal of Traumatic Stress, 25, 299-306. doi:10.1002/jts.21708.