Using a national database of all IVF clinics in the US, with data provided by SART, Sangita K. Jindal Ph.D., and her coauthors evaluated whether Hurricane Katrina was associated with worse pregnancy outcomes in the Gulf States in 2005-8. While no associations were found between hurricane exposure and preterm deliveries or miscarriage rates, a trend of fewer males born post-hurricane was found. It was postulated that extreme stress may be a factor that contributes to a reduced male-to-female ratio at birth.