 Life-time prevalence of PTSD was 31% for males and 27% for females.In a reanalysis of the NVVRS data, along with analysis of the data from the Matsunaga Vietnam Veterans Project, Schnurr, Lunney, Sengupta, and Waelde found that, contrary to the initial analysis of the NVVRS data, a large majority of Vietnam veterans suffered from PTSD symptoms (but not the disorder itself).Four out of five reported recent symptoms when interviewed 20–25 years after Vietnam.