You have gotten lots of good responses so I'll only add that trauma is considered a subjective (not objective) experience that overwhelms a person in any number of ways, including sense of control, sense of self, sense of what is right, etc. There is not an objective measure at least in the sense that trauma might lead to PTSD or depression. Some people go through things that might seem to be traumatic, but they don't develop symptoms. It isn't necessarily because of anything inside them. Sometimes what happens after an event makes a huge difference. If there is not proper support and understanding, then it can be more of a problem. I have PTSD with lots of trauma, but some are more charged than others and not because they are objectively worse but rather because the circumstances made them more difficult to deal with.