No doubt it helps.
The percentages you mentioned apply to the general population. The prevalence of post-traumatic stress disorder among the general public is between 8% and 14%. Typically, the number of women suffering from PSTD is higher because they are more exposed to sexual traumas. We know that sexual traumas are generally associated with more severe symptoms.
If we were to conduct a study in Ottawa, we would see that approximately 10% of the population have been victims of armed robbery or a car accident. So I find it surprising that the percentage for such a high-risk population, the Canadian armed forces, is the same.