Is every people affected by PTSD or GAD who goes through the traumatic event?

It is noted that not everyone who lives through a dangerous event gets PTSD.Infact,most will not get that disorder.
Many factors play a part in whether a person will get PTSD.Some of these are risk factors that make a person more likely to get PTSD.Other factors,called resilience factors,can help reduce the risk of the disorder.Some of these risk and resilience factors are present before the trauma and others become important during and after a traumatic event.Dealing with extra stress after the event,such as loss of a loved one,pain and injury or loss of a job or home can increase the risk factor.